Database Info

Qualcomm mdm6600 (GOBI) AT Commands

This post should really be a reply to the development thread found here:
http://forum.xda-developers.com/showthread.php?t=1412064&page=4
However, due to my lack of post count, I can't post it there.
In any case, I just wanted to say thank you to the OP. Utilizing the information in that thread and a few others, I was able to get my G2X to recognize 850 MHz UTMS providers. Although I haven't yet had a chance to test the data on these bands due to my current provider not having roaming agreements with them, it seems that being able to see the UTMS network may be a step forward.
Hopefully, I will have a chance to test further tomorrow and verify that the 1900 MHz UTMS band is also working properly.
If these tests prove successful, I will post details on how to enable these bands.

That's awesome, man! Hopefully it works when you test it tomorrow. Good luck

jwells777 said:
This post should really be a reply to the development thread found here:
http://forum.xda-developers.com/showthread.php?t=1412064&page=4
However, due to my lack of post count, I can't post it there.
In any case, I just wanted to say thank you to the OP. Utilizing the information in that thread and a few others, I was able to get my G2X to recognize 850 MHz UTMS providers. Although I haven't yet had a chance to test the data on these bands due to my current provider not having roaming agreements with them, it seems that being able to see the UTMS network may be a step forward.
Hopefully, I will have a chance to test further tomorrow and verify that the 1900 MHz UTMS band is also working properly.
If these tests prove successful, I will post details on how to enable these bands.
Click to expand...
Click to collapse
I am the OP of the thread you referred to, the one about the Qualcomm modem commands. I am very pleased that you were able to use that information to achieve the enabling of other cell radio bands which the modem is capable of but were not available for use. I tried too and was partially successful but not to the point of enabling the recognition of cell service providers which operate on those other bands. I hope that you have succeeded in achieving full operation of the 850 and 1900 MHz UMTS bands which will enable owners of the G2X/P999 phones to connect to networks which use those bands. I am looking forward to your next post.

Core Memory said:
I am the OP of the thread you referred to, the one about the Qualcomm modem commands. I am very pleased that you were able to use that information to achieve the enabling of other cell radio bands which the modem is capable of but were not available for use. I tried too and was partially successful but not to the point of enabling the recognition of cell service providers which operate on those other bands. I hope that you have succeeded in achieving full operation of the 850 and 1900 MHz UMTS bands which will enable owners of the G2X/P999 phones to connect to networks which use those bands. I am looking forward to your next post.
Click to expand...
Click to collapse
If I am understanding correctly, this would allow G2x phones to work with the new T-Mobile LTE 1900 Mhz signal, correct? Or am I way off base?

I believe it's AT&t's networks

jcbofkc said:
If I am understanding correctly, this would allow G2x phones to work with the new T-Mobile LTE 1900 Mhz signal, correct? Or am I way off base?
Click to expand...
Click to collapse
No. The LTE capability is not part of the Qualcomm mdm6600.
http://en.wikipedia.org/wiki/Qualcomm_Gobi
MDM6600™:
Multi-mode modem
HSPA+ with data rates of up to 14.4 Mbit/s
CDMA2000® 1xEV-DO Rev. A/Rev. B support
GPS functionality, including support for Assisted GPS

Since he hasn't posted anything since, it probably didn't succeed. I also sent him a PM which he didn't reply to.
jwells777 said:
This post should really be a reply to the development thread found here:
http://forum.xda-developers.com/showthread.php?t=1412064&page=4
However, due to my lack of post count, I can't post it there.
In any case, I just wanted to say thank you to the OP. Utilizing the information in that thread and a few others, I was able to get my G2X to recognize 850 MHz UTMS providers. Although I haven't yet had a chance to test the data on these bands due to my current provider not having roaming agreements with them, it seems that being able to see the UTMS network may be a step forward.
Hopefully, I will have a chance to test further tomorrow and verify that the 1900 MHz UTMS band is also working properly.
If these tests prove successful, I will post details on how to enable these bands.
Click to expand...
Click to collapse

Unfortunately, as suggested by Core Memory above, I have not been completely successful in this investigation; however, I will post what I discovered along the way for the benefit of others. Perhaps someone else can pickup where I left off and get things working.
First, a summary of the final status:
1) Updated NV Items to enable 850 MHz and 1900 MHz bands
2) Was able to see 850 MHz UMTS providers under the "Search Available Networks"
3) It appeared that a connection was being made to the UMTS provider based upon both the signal strength monitor in "About phone" and the Engineering Mode page that provides data regarding 3g connections
4) In the Engineering Mode page, it seemed that the device was trying to connect (login?) to the network but was not being successful with the login
5) When at the lock screen and forcing the connection to the 850 MHz UMTS network, the "Emergency Only" text appears further suggesting that the connection is working but that my configuration for the network may be wrong.
6) No 1900 MHz providers ever appeared in the network lists while searching. I am not sure whether this is because this band was not functioning or if it was because no such provider existed since I am not terribly familiar with the coverage where I am currently at.
For those who wish to follow this path and test in their own local markets, please see the following steps required to reach this point:
Tools needed:
1) QPST 2.7 (Build 366 or later)
2) QXDM 3.12.714 (or later)
Steps:
1) Install necessary tools on your computer.
2) Enable USB debugging (Settings-->Applications-->Development)
3) Connect phone to PC
4) In the hidden menu (1809#*999#), ensure that Port Setting is configured to CP USB.
5) Launch QPST Configuration
6) Under Ports, select Add New Port.
7) Locate your device and enable the port. (NOTE: There may be two ports available to you here. I believe that you want to use the one that is for Serial / USB/QC connections.
8) From QPST Configuration, launch the "Software Download" tool under the "Start Clients" heading.
9) From here, create a backup QCN file. This backup may or may not enable you to recover from making a mistake later. Also, there is alot of information in this file if you care to navigate through it.
10) Launch QXDM Professional.
11) View-->New-->Common-->NV Browser
12) Options-->Communications-->Target Port (Select your phone)
13) The previous step should have "enabled" the NV Browser lower pane
14) Read and record the following NV Items
a) (441) Band Class Preference (0xFFFF)
b) (946) Expand Band Preference 16 to 32 Bits (0xBFFF)
c) (2954) Bits 32 to 63 of Band Pref (0xFFFFFFFF)
d) (1877) RF Band Configuration (0x0000000002680380)
15) Update item 1877 per discussion below
16) Reboot phone
17) It may be necessary to configure the Modem Setting in the hidden menu to reflect the additional bands.
NV Item configuration discussion:
I am no mobile phone programming expert (< 4 hours playing with them at this level to date); however, as near as I can tell, item 1877 configures the hardware of the modem while items 441, 946, and 2954 appear to be some type of masking bits regarding what bands to prefer. As such, I believe that the original value of item 1877 enables the following RF bands:
(Bit:7) GSM (1800)
(Bit:8) GSM Extended GSM (E-GSM)
(Bit:9) GSM Primary GSM (P-GSM)
(Bit:19) GSM (850)
(Bit:21) GSM (1900)
(Bit:22) WCDMA Band I (2100)
(Bit:25) WCDMA Band IV (1700)
If you set 1877 to 0x000000006E80380, it should enable the following:
(Bit:7) GSM (1800)
(Bit:8) GSM Extended GSM (E-GSM)
(Bit:9) GSM Primary GSM (P-GSM)
(Bit:19) GSM (850)
(Bit:21) GSM (1900)
(Bit:22) WCDMA Band I (2100)
(Bit:23) WCDMA Band II (1900)
(Bit:25) WCDMA Band IV (1700)
(Bit:26) WCDMA Band V (850)
If anyone succeeds in getting any further using this information, I would be very curious to hear of your success. Also, please do share with the community such that we can collectively move forward.
Disclaimer: I accept no responsibility for any damage that you may cause to your phone with these tools or procedures. Please note that these tools give you fairly low-level access to your system that enable you to significantly mess things up. Further, please note that modifying the radio bands on this device may void your warranty and/or be in violation of local regulations as set by your local authority (e.g., the FCC).

jwells777 said:
Unfortunately, as suggested by Core Memory above, I have not been completely successful in this investigation; however, I will post what I discovered along the way for the benefit of others. Perhaps someone else can pickup where I left off and get things working.
First, a summary of the final status:
1) Updated NV Items to enable 850 MHz and 1900 MHz bands
2) Was able to see 850 MHz UMTS providers under the "Search Available Networks"
3) It appeared that a connection was being made to the UMTS provider based upon both the signal strength monitor in "About phone" and the Engineering Mode page that provides data regarding 3g connections
4) In the Engineering Mode page, it seemed that the device was trying to connect (login?) to the network but was not being successful with the login
5) When at the lock screen and forcing the connection to the 850 MHz UMTS network, the "Emergency Only" text appears further suggesting that the connection is working but that my configuration for the network may be wrong.
6) No 1900 MHz providers ever appeared in the network lists while searching. I am not sure whether this is because this band was not functioning or if it was because no such provider existed since I am not terribly familiar with the coverage where I am currently at.
For those who wish to follow this path and test in their own local markets, please see the following steps required to reach this point:
Tools needed:
1) QPST 2.7 (Build 366 or later)
2) QXDM 3.12.714 (or later)
Steps:
1) Install necessary tools on your computer.
2) Enable USB debugging (Settings-->Applications-->Development)
3) Connect phone to PC
4) In the hidden menu (1809#*999#), ensure that Port Setting is configured to CP USB.
5) Launch QPST Configuration
6) Under Ports, select Add New Port.
7) Locate your device and enable the port. (NOTE: There may be two ports available to you here. I believe that you want to use the one that is for Serial / USB/QC connections.
8) From QPST Configuration, launch the "Software Download" tool under the "Start Clients" heading.
9) From here, create a backup QCN file. This backup may or may not enable you to recover from making a mistake later. Also, there is alot of information in this file if you care to navigate through it.
10) Launch QXDM Professional.
11) View-->New-->Common-->NV Browser
12) Options-->Communications-->Target Port (Select your phone)
13) The previous step should have "enabled" the NV Browser lower pane
14) Read and record the following NV Items
a) (441) Band Class Preference (0xFFFF)
b) (946) Expand Band Preference 16 to 32 Bits (0xBFFF)
c) (2954) Bits 32 to 63 of Band Pref (0xFFFFFFFF)
d) (1877) RF Band Configuration (0x0000000002680380)
15) Update item 1877 per discussion below
16) Reboot phone
17) It may be necessary to configure the Modem Setting in the hidden menu to reflect the additional bands.
NV Item configuration discussion:
I am no mobile phone programming expert (< 4 hours playing with them at this level to date); however, as near as I can tell, item 1877 configures the hardware of the modem while items 441, 946, and 2954 appear to be some type of masking bits regarding what bands to prefer. As such, I believe that the original value of item 1877 enables the following RF bands:
(Bit:7) GSM (1800)
(Bit:8) GSM Extended GSM (E-GSM)
(Bit:9) GSM Primary GSM (P-GSM)
(Bit:19) GSM (850)
(Bit:21) GSM (1900)
(Bit:22) WCDMA Band I (2100)
(Bit:25) WCDMA Band IV (1700)
If you set 1877 to 0x000000006E80380, it should enable the following:
(Bit:7) GSM (1800)
(Bit:8) GSM Extended GSM (E-GSM)
(Bit:9) GSM Primary GSM (P-GSM)
(Bit:19) GSM (850)
(Bit:21) GSM (1900)
(Bit:22) WCDMA Band I (2100)
(Bit:23) WCDMA Band II (1900)
(Bit:25) WCDMA Band IV (1700)
(Bit:26) WCDMA Band V (850)
If anyone succeeds in getting any further using this information, I would be very curious to hear of your success. Also, please do share with the community such that we can collectively move forward.
Disclaimer: I accept no responsibility for any damage that you may cause to your phone with these tools or procedures. Please note that these tools give you fairly low-level access to your system that enable you to significantly mess things up. Further, please note that modifying the radio bands on this device may void your warranty and/or be in violation of local regulations as set by your local authority (e.g., the FCC).
Click to expand...
Click to collapse
You've made a lot of progress, your information is very useful. I'll use it for further exploration.
Did you test it with a SIM card with a data plan which uses those bands?
Do you know how to use QPST and/or QXDM flash the phone with a binary file for the baseband?

I did try to connect using sim cards with data plans on the specified frequencies.
As for flashing a baseband, it seems that you should be able to do so with these tools; however, I didn't look into it.
Sent from my LG-P999 using XDA

jwells777 said:
I did try to connect using sim cards with data plans on the specified frequencies.
As for flashing a baseband, it seems that you should be able to do so with these tools; however, I didn't look into it.
Sent from my LG-P999 using XDA
Click to expand...
Click to collapse
The following was done while my phone is using the WIND SIM card which is my carrier and is restricted to AWS (WCDMA 1700) and Network Mode is set to WCDMA only.
I used your instructions to enable the UMTS 850 and 1900 MHz bands. One clarification is necessary. The HexaDecimal number 0x6e80380 = Decimal number 115868544 = Binary number 0b110111010000000001110000000.
The binary number is read from right to left with the first binary bit on the extreme right designated as bit 0 of the 27 bit sequence. The binary number is the key to the hexadecimal number used to program the RF Band Configuration in QXDM. For example, according to Jwells777, bit 23 is set to binary 1 to enable WCDMA Band II (band 2) and bit 26 is set to binary 1 to enable WCDMA band V (band 5). Refer to Jwells777 post in this thread which states the binary bits used to set the phone to use the phone's bands. Here's a binary-decimal-hexadecimal converter: http://www.mathsisfun.com/binary-decimal-hexadecimal-converter.html
The HexaDecimal number 0x000000006E80380 can be entered directly for setting "RF Band Configuration" at line 1877 in the NV browser. The HexaDecimal number is converted into the decimal number 115868544 which will appear when another read is performed. In Engineering Mode, the SW Enabled Band reading of my phone changed from 0x0000000102400000 to 0x0000000106C0000. When I changed the phone's setting to Automatic Band Selection, the SW EnableBand reading changed to 0x0000000106e80180. Changing the settings for Band Selection and/or Network Mode will change the SW EnableBand reading on page 5 of Engineering Mode.
In Band Selection, I enabled WCDMA 1900 which caused my connection to WIND's AWS 1700 to drop. I Looked at page 5 (RF Calibration) of Engineering Mode to see which bands were activated and found:
WCDMA1 : 22.37, 22.45, 0.00
WCDMA2 : 0.00, 0.00, 0.00
WCDMA4 : 23.47, 23.19, 0.00
WCDMA5 : 0.00, 0.00, 0.00
WCDMA8 : 0.00, 0.00, 0.00
GSM850 : 32.70, 32.63, 0.00
GSM900 : 32.76, 32.71, 0.00
DCS1800 : 29.40, 29.50, 0.00
PCS1900 : 30.10, 29.90, 0.00
LOSS:
-1.06, -1.18, -1.24
-1.54, -1.64, -1.74
-1.80, -1.79, -2.01
-2.11, -2.21
The same readings occur with Band Selection set to Automatic or manually to any other band except AWS which is the UMTS band the phone was set up to use at the factory.
This indicates that WCDMA2, 5, and 8 are not RF calibrated but DCS 1800 and PCS 1900 are RF calibrated.
I also found that
When I do a network search, it finds WIND and Public Mobile which operate on UMTS 1700 (AWS) and Bell and Telus which operate on UMTS 850 and 1900 but not Rogers which also operates on UMTS 850 and 1900. (Rogers does appear if I search for GSM networks too.)
"In Canada, UMTS coverage is being provided on the 850 MHz and 1900 MHz bands on the Rogers and Bell-Telus networks. Bell and Telus share the network. Recently, new providers Wind Mobile, Mobilicity and Videotron have begun operations in the 1700 MHz band."http://en.wikipedia.org/wiki/Universal_Mobile_Telecommunications_System
That indicates it is able to receive signals on UMTS 850 (Band 5) and 1900 (Band 2) which should enable the phone to see TELUS, Bell and Rogers.
http://en.wikipedia.org/wiki/UMTS_frequency_bands
When I select connection to Bell or TELUS, the phone tries to register but fails with the message: "Unable to connect to this network at this time. Please try again later." That message is generated by the phone's firmware/software, not the network.
I haven't yet tested the phone with a SIM Card for Rogers or Bell or TELUS. A friend has a Rogers SIM card with a data plan but I don't think it will be of any use to test the phone's supposed additionally enabled bands.
Conclusions:
Cognitive overload.
I am finding this quite confusing because of the variable terminology used such as UMTS, WCDMA, PCS, DCS, and the various bands and transmit and receive frequencies used for each protocol. If someone could make more sense out of the information I've provided, that would be very helpful.
Questions:
Engineering Mode Page 5 (RF Calibration) indicate that WCDMA Bands 2,5, and 8 are not RF calibrated but DCS 1800 and PCS 1900 are. Does this mean that the phone will not transmit on the WCDMA Bands 2,5 and 8 because the RF calibration for transmitting is not available?
If anyone can add something useful to this thread, that would be greatly appreciated.

nvm sorry mood pls delete this

Glad to hear that someone else was able to see the other bands using the information that I posted.
I would also add that I am able to see att in the US but not connect. I receive the same error mentioned by CoreMemory. If anyone has access to an O2X and could provide the qcn dump, it may help configure any other NV Items related to the new bands that we have missed.
Sent from my LG-P999 using XDA

HELP
Core Memory said:
You've made a lot of progress, your information is very useful. I'll use it for further exploration.
Did you test it with a SIM card with a data plan which uses those bands?
Do you know how to use QPST and/or QXDM flash the phone with a binary file for the baseband?
Click to expand...
Click to collapse
hi i'm trying but when insert the code 1809#*999# send me a error " MMI CODE CANDELED "

jwells777 said:
Glad to hear that someone else was able to see the other bands using the information that I posted.
I would also add that I am able to see att in the US but not connect. I receive the same error mentioned by CoreMemory. If anyone has access to an O2X and could provide the qcn dump, it may help configure any other NV Items related to the new bands that we have missed.
Sent from my LG-P999 using XDA
Click to expand...
Click to collapse
I wonder if the qcn dump from the O2X is useful since it has a different modem, it doesn't have the Qualcomm MDM6600 which is in the G2X/P999.
If we could get a qcn dump from another phone which uses the MDM6600 on the bands we want to get working, that would be a lot of help.
The Qualcomm Mobile Data Modem Software Interface 80-Vr001-2 manual would be very useful too.

Core Memory said:
If anyone can add something useful to this thread, that would be greatly appreciated.
Click to expand...
Click to collapse
i think if you post that into LG Optimus 2x forums with some instructions and explaining them. we could get the configuration from them. Soo you could go and ask them and explain them how to get those codes.
EDIT: NVM i just REAd your last post.

If you guys need a tester for anything, im all ears

Core Memory said:
I wonder if the qcn dump from the O2X is useful since it has a different modem, it doesn't have the Qualcomm MDM6600 which is in the G2X/P999.
If we could get a qcn dump from another phone which uses the MDM6600 on the bands we want to get working, that would be a lot of help.
The Qualcomm Mobile Data Modem Software Interface 80-Vr001-2 manual would be very useful too.
Click to expand...
Click to collapse
I didn't think of the fact that the modems are different. I agree with you that it would probably be more useful to have the dump from a phone with the 6600 that is configured for the new bands
Sent from my LG-P999 using XDA

jwells777 said:
I didn't think of the fact that the modems are different. I agree with you that it would probably be more useful to have the dump from a phone with the 6600 that is configured for the new bands
Sent from my LG-P999 using XDA
Click to expand...
Click to collapse
I don't know of anyone with one. As well, the file contains info which the person who supplies it would have to trust us not to use.

we can ask those guys for the configuration codes it seems they use the same modem or item.
http://forum.xda-developers.com/showthread.php?t=992635#12257150

[Q] Nexus S is not getting Mobile network(GSM) signal

Hi All,
I got a Nexus S (I9020T) from US. I am trying to use it in India with a GSM carrier - BSNL ( gsm 900Mhz).
Problem :
When ever I am inserting GSM Sim, it catches the signal (both gsm + data) but after 3-5 minutes only gsm signal is lost. I cannot make or receive calls, it says emergency call only.
I tried to make call, it says "no mobile network available". Where as i could surf the net with 3g data plan.
what I did :
1) I tried to reboot the phone. Still no signal.
2) I tried to remove battery and sim , and put it back and switch on. Still no signal.
3) I tried to dial *#*#4636#*#* . Enter into phone information-->Select preferred network type to - WCDMA preferred, GSM only (all GSM options tried)
and reboot the phone. Still no help.
Please help me. I am completely frustrated.
Regards,
Rajesh

Contact your provider , they might be blocking your device for some reason ...

Have you added the new APN?
(I'm assuming you're on 4.0)
Settings --> More... --> Mobile networks --> Access Point Names --> Press menu button and select "New APN"
Google the APN settings for your provider and input them. Make sure you remember to press menu and SAVE APN when your finished.

krymson0 said:
Have you added the new APN?
(I'm assuming you're on 4.0)
Settings --> More... --> Mobile networks --> Access Point Names --> Press menu button and select "New APN"
Google the APN settings for your provider and input them. Make sure you remember to press menu and SAVE APN when your finished.
Click to expand...
Click to collapse
Im in the same boat tried to set apn wont save no matter what i do. please help.

Hi
krymson0 said:
Have you added the new APN?
(I'm assuming you're on 4.0)
Settings --> More... --> Mobile networks --> Access Point Names --> Press menu button and select "New APN"
Google the APN settings for your provider and input them. Make sure you remember to press menu and SAVE APN when your finished.
Click to expand...
Click to collapse
Hi,
Thanks for reply..
Yes, I added APN..(it automatically appeared) and also I am able to surf the net due to 3G data plan, but strangely i am not able to make any calls nor receive any calls, it says no mobile network available

What is the version of your baseband? You can check it in Settings/About or in Fastboot/Bootloader mode.
What is the model written beneath your battery on the sticker?

anglergab said:
What is the version of your baseband? You can check it in Settings/About or in Fastboot/Bootloader mode.
What is the model written beneath your battery on the sticker?
Click to expand...
Click to collapse
Hi, baseband version - I9020XXKI1
Kernel Version - 3.0.8-g6656123
model -I9020T

The baseband is OK. It supports 900 MHz operation. You should contact your operator regarding this issue, it can happen they use special/non-standard GSM solutions (frequency sets, etc.) which is not supported by this phone.
You can try switching to 2G mode only (you can find this in Settings/Mobile networks).
You should check in this mode the signal in Settings/About/Status (in dBm).
If it's below -100 dBm then signal coverage is poor or unsupported frequencies are used by your operator or your HW radio chip is corrupted.
To rule out the last possibility, you should check your signal and dBm value with a SIM card from another operator.
UMTS functionality is handled by a separate chip (not by GSM radio), so it can happen 3G is OK but GSM (2G) not.

Hi
anglergab said:
The baseband is OK. It supports 900 MHz operation. You should contact your operator regarding this issue, it can happen they use special/non-standard GSM solutions (frequency sets, etc.) which is not supported by this phone.
You can try switching to 2G mode only (you can find this in Settings/Mobile networks).
You should check in this mode the signal in Settings/About/Status (in dBm).
If it's below -100 dBm then signal coverage is poor or unsupported frequencies are used by your operator or your HW radio chip is corrupted.
To rule out the last possibility, you should check your signal and dBm value with a SIM card from another operator.
UMTS functionality is handled by a separate chip (not by GSM radio), so it can happen 3G is OK but GSM (2G) not.
Click to expand...
Click to collapse
Thanks for reply..n helping me out.
I believe my carrier BSNL uses standard GSM frequencies..samsung note, galaxy series pretty much work with it.
I tried switching to 2G mode, same problem.
I checked signal strength : it varies from -91dBm to -93dBm.
I inserted other GSM carrier SIM , same problem - no signal.
This Nexus S mobile was working fine with T-mobile when I was in USA.
It seems some Hardware radio incompatibility or something else..God Knows!!

Hi
Rajeshandroid said:
Thanks for reply..n helping me out.
I believe my carrier BSNL uses standard GSM frequencies..samsung note, galaxy series pretty much work with it.
I tried switching to 2G mode, same problem.
I checked signal strength : it varies from -91dBm to -93dBm.
I inserted other GSM carrier SIM , same problem - no signal.
This Nexus S mobile was working fine with T-mobile when I was in USA.
It seems some Hardware radio incompatibility or something else..God Knows!!
Click to expand...
Click to collapse
One thing i noted, it identifies the carrier correctly in Settings-->About-->Status-->Network
IMEI(*#06#) shows different from the IMEI written under battery.

Are you using Custom Rom?

Why IMEI difference between device screen and behind battery ? something wrong is here ...

mahanddeem said:
Why IMEI difference between device screen and behind battery ? something wrong is here ...
Click to expand...
Click to collapse
Your /efs is corrupted and some carriers block generic IMEIs, that's where your issue lies
Sent from my ice cream powered Nexus S

Wrong IMEI
Yes my /efs is corrupted. My IMEI shows 004999010640000.
I came to know it happened due to flashing custom ROMs ( Ohh god why did i flash custom ROM) .
I used CWM. This didn't back up my /efs folder and hence the problem.
Its my bad luck, even i did not read any suggestion to back up /efs folder in any guide for flashing custom ROM.
Its really waste of time and effort on my part to go for Android. So much complexity for just a cellphone.
I would better go for iPhone. (Thank God , no custom IOS).
RIP - my Nexus S.
Thanks everybody for helping me and answering me.

The IMEI can be restored, so your Nexus S can be made registered on your operator's network. Instructions to do so can be found, but it can be illegal in your country. Modifying an IMEI is generally is, but if it's done for restoring purposes, then it might not fall in the same category.
Rajeshandroid said:
So much complexity for just a cellphone.
Click to expand...
Click to collapse
The problem with your statement is, that these are not just cellphones, much more minicomputers (with GSM radio and UMTS modem).
Rajeshandroid said:
I would better go for iPhone. (Thank God , no custom IOS).
RIP - my Nexus S.
Click to expand...
Click to collapse
Android is far better customizable and not proprietary software as iOS. Apple can keep its price unrealistically high. They cost far much than their real value. So they are bought not because their usefulness, rather to show other people that one can afford it.

[Completed] Help! Tmobile Samsung S7 locked only on 1800 mhz band. Already rooted

Hi everyone.
Last time i was in xda forums was when i try to mod my windows mobile CE 5.0 lol
This is my sad story:
I bought in the US a samsung s7 with T-Mobile SM-G930T, i paid a guy who 'unlocked' it in there. After that i brought it to Colombia, in here i run the T-mobile unlock app which succeded and erased itself after that. Then the cellphone started working with all the mobile companies in my country except for one that operates over 1800 mhz, other companies do work fine. When i insert a simcard of this company it just says that 'Not registered in network' and wont do nothing. I already tried to put the APN settings correctly (Actually it automatically loaded every company settings detected).
After that i tried to root with a modded Odin with a custom ROM and it succeeded and i got the SuperSU application, tho the cellphone its a little laggy now, but neither that way it worked. Anyone knows how where should i start looking?
I went to this company support and they sent me to Samsung support, which redirected me back to this company, lol
Thanks in advance guys

XDA Visitor said:
Hi everyone.
Last time i was in xda forums was when i try to mod my windows mobile CE 5.0 lol
This is my sad story:
I bought in the US a samsung s7 with T-Mobile SM-G930T, i paid a guy who 'unlocked' it in there. After that i brought it to Colombia, in here i run the T-mobile unlock app which succeded and erased itself after that. Then the cellphone started working with all the mobile companies in my country except for one that operates over 1800 mhz, other companies do work fine. When i insert a simcard of this company it just says that 'Not registered in network' and wont do nothing. I already tried to put the APN settings correctly (Actually it automatically loaded every company settings detected).
After that i tried to root with a modded Odin with a custom ROM and it succeeded and i got the SuperSU application, tho the cellphone its a little laggy now, but neither that way it worked. Anyone knows how where should i start looking?
I went to this company support and they sent me to Samsung support, which redirected me back to this company, lol
Thanks in advance guys
Click to expand...
Click to collapse
Hi,
It seems your phone is region locked due to which you are locked onto a particular mhz network frequency...
yes the first step would be to try to a custom rom to see if this over rides this situation or you could try below situation below... this is ideally for s6.... or atlast google search...
http://forum.xda-developers.com/verizon-galaxy-s6/general/enabling-using-servicemode-t3109579
Ok, since now we have root, many users wanted to know if they can lock onto certain LTE frequency bands using Samsung's ServiceMode. So here is a quick guide.
ServiceMode is Samsung's proprietary Engineering Mode, built within the TouchWiz framework, readily available on International variants, and some domestic like T-Mobile. It allows us to observe the RF connection, change certain RF related settings, and lock our phones onto specific technologies and frequencies. Sadly, Verizon has been blocking user access to Engineering Mode for years now.
So in order to enable access to ServiceMode on Verizon GS6/Edge you'll need to:
- Download Root Explorer
- Navigate to /efs/carrier/HiddenMenu
- Use TextEdit to open it (not text viewer)
- Change the value to ON (upper case), Save and Exit
- Restart the phone
Once restarted you can dial:
*#0011# to observe the connection
If you want to lock your device onto a specific LTE band (13, 4, 2):
*#27663368378#
- UE Settings & Info
- Settings
- Protocol
- NAS
- Network Control
- Band Selection
- LTE Band Selection
Here you can force your phone onto a specific Verizon LTE Band (13, 4, 2), or use LTE ALL if you have VoLTE (Advanced Calling) enabled as this will eliminate the need for CDMA radios.
To go back to default, go through the same process but at Band Selection make sure to chose AUTOMATIC.
There are a lot more settings here, you can enable AMR WB on UMTS if you use T-Mobile so you can get HD Voice on their UMTS layer, etc... Carrier Aggregation has already been enabled, so no need to tweak that.
If you aren't sure what certain settings and values correspond to, it's better to avoid tinkering. You're responsible for your own actions.

According to this thread, he posted via visitor.
Then he registered and posted his query here so he seems to have posted in correct section.
Just documenting this here.
Thread closed!
Regards
Vatsal,
Forum Moderator.

S6 unable to see test mobile network

I'm building a test mobile network on some laptops and with a software defined radio based on Open AirInterface (is googleable, but I can't post the link cos I'm a newb) code, and I have this up and running. Additionally, I've bought some programmable SIMs to work with it on a bunch of phones. The information on these I've added into my HSS implementation. The Country Code/Network code deployed on the SIMs is 901/70 - so it doesn't interfere with commercial networks.
I'm testing with a bunch of phones in an isolation chamber, and my end goal is to shift the network into something I have a license for and "go public", but this network will have a low channel bandwidth (3MHz or 1.4MHz in Band 3 LTE). Not many phones have supported this, so I started with a 5MHz channel, which most do support - and I've successfully connected an S4 and a Nexus to my little network. However, when I tried the S6 with a SIM that worked in another phone, it cannot even see the network. I've seen hints of Samsung doing operator whitelisting, but would like to know if this is the case and, if possible, how to add my operator codes into the whitelist.
So far, I've tried the following:
a) "*#0011#" puts you into ServiceMode where you used to be able to enable/disable frequency bands and other such settings with the "Q0000" menu entry - but it looks like Samsung have squished this, also I know the phone has Band 3 operational as I can put a commercial SIM in it that runs on that band. I've not found any way of actually modifying any settings within this mode.
b) I found the file "/system/etc/apns-conf.xml" which contains a list of operator APN addresses - I updated mine to contain my settings, but no joy, and if I "reset to default" my APN settings, my settings are not picked up and I have to manually add my APN (but at least that stays selected)
c) I found some databases in "/data/data/com.android.providers.telephony/databases/", in particular "nwk_info.db" and added my network details to it. The phone then changed from basically saying I was only able to make emergency calls to "Selected mobile network (901/70) unavailable", which kind of at least hints I've moved it in the right direction
The S6 is running a rooted factory reset, and allows SIMS from two different commercial operators on it so it should be completely unlocked. It's never been out of the country, so should have "defeated" the region locks that Sammy put on the phones nowadays (although it begs the question whether rooting the phone resets this and perhaps it's still awaiting 5 mins of calls via a local SIM?).
Does anyone know of a whitelist of MNC/MCC numbers I can add my settings to? Or any other possible solution to this?
The long winded solution is to change the MNC/MCC info on each of my SIMs, but that's a PITA and I'm not even sure it'll work yet (I will attempt to try one soon, but changing the configs on my mobile network is also non-trivial!)

Forcefully enable "5G Only Mode"

Hi,
I'm looking to enable "5G Only" mode (packet switching to be more specific) on my Note 20 Ultra. I have tried all the apps available out there but the closest I've come is that I have enabled LTE Only mode (which works perfectly as it should btw). Most apps say that they can enable "5G only" mode but there are no options to do so in the menu.
Calling out all experts for their kind recommendations. My device model is SM-N986B/DS
PS. I'm looking for a way to do this without rooting my phone.
Best Regards.

You can by launching the hidden phone activity. For that you can you can download Activity Launcher, and search for "hidden", then open the phone settings one.
You'll the be able to use the select band only mode, and select all 5G NR only.
Il do it for 4G and 5G for when it'll come, and works flawlessly (it never goes back to 3/2G).

Nastrahl said:
You can by launching the hidden phone activity. For that you can you can download Activity Launcher, and search for "hidden", then open the phone settings one.
You'll the be able to use the select band only mode, and select all 5G NR only.
Il do it for 4G and 5G for when it'll come, and works flawlessly (it never goes back to 3/2G).
Click to expand...
Click to collapse
Hi, thank you so much for your reply. The thing is that I tried that and I couldn't see 5G NR Only option. And if I select "Band Selection Mode", then it displays the message "Fail". Screenshots attached for reference. Can you please guide me further?

mani.1 said:
Hi, thank you so much for your reply. The thing is that I tried that and I couldn't see 5G NR Only option. And if I select "Band Selection Mode", then it displays the message "Fail". Screenshots attached for reference. Can you please guide me further?
Click to expand...
Click to collapse
You're welcome.
Sure!
You have to go to the hamburger menu then "Band Selection".
Here you select all the bands you want, then you turn the button on the upper right on. It will automatically select the bands selection mode afterwards.

Oops I screwed up with the screenshots
Here they are.

It "normal" that after the band selection mode activated, that the bands you selected doesn't show anymore.
But then in the network band mode, the band selection setting is now applied and working.

@Nastrahl
Thank you so much man. Okay one more clarity I need, lets suppose I choose the NR B77 Band in the band selection, then:
1. Do all the other technologies (i.e. 2G/3G/LTE) gets disabled and the "network connectivity mode" gets automatically set to "5G Only" ?
2. Will this mimic the same scenario when I choose "LTE only" mode in which the phone basically shifts to packet switching mode instead of the the regular circuit switching mode. (i.e. only mobile data is enabled, you can't receive or make calls in this mode)
Cheers!

mani.1 said:
@Nastrahl
Thank you so much man. Okay one more clarity I need, lets suppose I choose the NR B77 Band in the band selection, then:
1. Do all the other technologies (i.e. 2G/3G/LTE) gets disabled and the "network connectivity mode" gets automatically set to "5G Only" ?
2. Will this mimic the same scenario when I choose "LTE only" mode in which the phone basically shifts to packet switching mode instead of the the regular circuit switching mode. (i.e. only mobile data is enabled, you can't receive or make calls in this mode)
Cheers!
Click to expand...
Click to collapse
Hi, no problem.
1. Yes in that case all except the technology (5G in that case) you chose and the band you selected is disabled. So it's the same as if you would have set the phone to "5G only" if that explicit mode was available.
I personally set it by selecting all LTE and 5G bands, to mimic a "only LTE and 5G" mode.
2. It depends if your provider supports voice over LTE to make calls without rendering back to 3G or 2G network.
In my case, I can use LTE for both so I didn't care about 3G/2G, that why I set bands selection to only LTE and 5G bands (the latter when it will be available in my country)
But some providers doesn't supports calling with LTE and needs to switch back to the older 3G or 2G to be able to. Unfortunately if you lock bands to LTE, calling won't work at all (only data), and about 5G it may also depend if they support it.
If they do it will work with bands selection mode, otherwise no.
Have a good day!

Nastrahl said:
Hi, no problem.
1. Yes in that case all except the technology (5G in that case) you chose and the band you selected is disabled. So it's the same as if you would have set the phone to "5G only" if that explicit mode was available.
I personally set it by selecting all LTE and 5G bands, to mimic a "only LTE and 5G" mode.
2. It depends if your provider supports voice over LTE to make calls without rendering back to 3G or 2G network.
In my case, I can use LTE for both so I didn't care about 3G/2G, that why I set bands selection to only LTE and 5G bands (the latter when it will be available in my country)
But some providers doesn't supports calling with LTE and needs to switch back to the older 3G or 2G to be able to. Unfortunately if you lock bands to LTE, calling won't work at all (only data), and about 5G it may also depend if they support it.
If they do it will work with bands selection mode, otherwise no.
Have a good day!
Click to expand...
Click to collapse
Worked like a charm. Thank you for all the help and the detailed explanation. @Nastrahl .

mani.1 said:
Worked like a charm. Thank you for all the help and the detailed explanation. @Nastrahl .
Click to expand...
Click to collapse
You're welcome. I'm glad it helped

I look for that app activity launcher and there's a few.... can you direct me to it....

edwardob said:
I look for that app activity launcher and there's a few.... can you direct me to it....
Click to expand...
Click to collapse
You have to search for "hidden". And you will get two options.

edwardob said:
I look for that app activity launcher and there's a few.... can you direct me to it....
Click to expand...
Click to collapse
It's this one : https://play.google.com/store/apps/details?id=de.szalkowski.activitylauncher

Nastrahl said:
You can by launching the hidden phone activity. For that you can you can download Activity Launcher, and search for "hidden", then open the phone settings one.
You'll the be able to use the select band only mode, and select all 5G NR only.
Il do it for 4G and 5G for when it'll come, and works flawlessly (it never goes back to 3/2G).
Click to expand...
Click to collapse
Hello i tried to download activity launcher and search for the word "hidden" but no result.
I am using huawei P40 PRO. no gms
is it possible to force 5g on my phone? i hope it can thank you

jcdc0504 said:
Hello i tried to download activity launcher and search for the word "hidden" but no result.
I am using huawei P40 PRO. no gms
is it possible to force 5g on my phone? i hope it can thank you
Click to expand...
Click to collapse
I don't own an Huawei phone so it may have a different name, or it may not exist on that model at all...
Unfortunately it could be a Samsung only feature.

Nastrahl said:
I don't own an Huawei phone so it may have a different name, or it may not exist on that model at all...
Unfortunately it could be a Samsung only feature.
Click to expand...
Click to collapse
thank you for informing me.

I
Nastrahl said:
You can by launching the hidden phone activity. For that you can you can download Activity Launcher, and search for "hidden", then open the phone settings one.
You'll the be able to use the select band only mode, and select all 5G NR only.
Il do it for 4G and 5G for when it'll come, and works flawlessly (it never goes back to 3/2G).
Click to expand...
Click to collapse
I was able to launch the hidden after rooting my phone, please is there any way to lunch without root?
After selecting all NR I don't get 5G, I get (no service) meanwhile I am in the 5G area and I use to get 5G for some time like the attached picture.
{
"lightbox_close": "Close",
"lightbox_next": "Next",
"lightbox_previous": "Previous",
"lightbox_error": "The requested content cannot be loaded. Please try again later.",
"lightbox_start_slideshow": "Start slideshow",
"lightbox_stop_slideshow": "Stop slideshow",
"lightbox_full_screen": "Full screen",
"lightbox_thumbnails": "Thumbnails",
"lightbox_download": "Download",
"lightbox_share": "Share",
"lightbox_zoom": "Zoom",
"lightbox_new_window": "New window",
"lightbox_toggle_sidebar": "Toggle sidebar"
}
Any solution please?

mustaph12 said:
I
I was able to launch the hidden after rooting my phone, please is there any way to lunch without root?
After selecting all NR I don't get 5G, I get (no service) meanwhile I am in the 5G area and I use to get 5G for some time like the attached picture.
View attachment 5724537
Any solution please?
Click to expand...
Click to collapse
Unfortunately not anymore as far as I know

Nastrahl said:
Unfortunately not anymore as far as I know
Click to expand...
Click to collapse
Thank you

Nastrahl said:
You can by launching the hidden phone activity. For that you can you can download Activity Launcher, and search for "hidden", then open the phone settings one.
You'll the be able to use the select band only mode, and select all 5G NR only.
Il do it for 4G and 5G for when it'll come, and works flawlessly (it never goes back to 3/2G).
Click to expand...
Click to collapse
Hey, can u help me also?
I am trying to use 5g only on my note 20 ultra, but it keeps switching to 4g after a few minutes.
I downloaded the activity launcher and the contents are shown in the screenshot, when i try to open the call settings it shows an error and doesn't do anything.
I am currently on one ui 5.1 android 13
Thankyou