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[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.

[Q] Why SIM country & operator codes wrong and how were additional APN's installed?

[Q] Why SIM country & operator codes wrong and how were additional APN's installed?
I’m in Ireland, The offices of the Garda Ombudsman (GSOC) was in the papers earlier this year because it was suspected they were being bugged. Also apparently the Gardai have been recording calls to and from police stations for years without the public (or lawyers) being informed. So recording of telephone calls/interception is topical here is topical now.
Wearing my tin-hat, I did a full wipe and installed a Cyanogen-based ROM on my rooted Samsung Galaxy S (i9000). I manually input the correct APN settings for my network operator (48Months/O2-IRL) and I installed Orbot
I never got a network configuration SMS/MMS from the network operator. But somehow, I found also installed (not immediately) were the following APNs:
Eastlink Internet: wisp.mobi.eastlink.ca
Proximus Internet: internet.proximus.be
Eastlink MMS: mms.mobi.eastlink.ca
Proximus MMS: event.proximus.be
It’s a new SIM from when I changed network operator a few months back. The above four APNs were also installed when it came and I queried this to 48 Months with no response. I never saw these APN’s with my previous network operator.
I downloaded a SIM reader app and got the following results:
SIM State - network locked
SIM country code - be
SIM Operator code 20601
SIM IMSI 20601 8816 582453
Phone type - gsm
Network country ID - ie
Net Oper code - 27202
Net Op name - O2 Irl
Net type - HSDPA
Voice roaming - on
Data roaming - off (even though in my phone settings it is showing as on)
So the SIM country code and SIM Operator code are wrong – being for an ISP in Belgium, and also there are those additional APNs which I never installed.
To my simple mind, APN settings are sent by network operators for auto configuration, so these APN’s came from the network operator. However, I have again queried with them and now they say “The tech team have replied this morning to confirm that there is nothing from the network or anything linked with your SIM that would cause your phone to change the settings on your phone.
Due to that they have had no option but to advise you that the phone must be the reason for this.”
But to my knowledge, there are no preinstalled APNs on the ROM (cm-MacKAY ROM Android 4.4.2), and also a 3rd party app can not edit the SIM country code /SIM operator code.
I would love to get an opinion from a developer more familiar with SIMs/APN’s please

Nearly SOLVED
OK, So tin hat is back in its box now...I emailed Eastlink in Canada and they seem to have solved it - very impressive especially when compared with the responses from my network!
"I have had our network team review your question and they have determined there is no security issue and no data traffic that would affect you.
Google has been changing the method that they use for APNs in AOSP. As part of that change APN's are preloaded in Kit Kat. Eastlink's APNs are correctly present in Kit Kat for Home Network Identity 20601.
If you require further assistance with your questions it is recommended the you contact Android Open Source Project or the Cyanogenmod on line.
Thank You for contacting Eastlink Wireless Customer care. "

[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!)

One Plus One Signal Error Problem

Hi there!! Well my one plus one had the problem of the continuous restart, and solve it, following the steps of the htcmania tutorial from reboot (i am new so xda doesnot allow me to post outside links)
Everything is perfect, everything works again. The problem: It does not detect the Telcel sim. I am from Mexico ,by the way.
In Settings -> Mobile Networks -> Preferred Network Type, select 3G (if I select LTE does not recognize anything), then:
Settings -> Mobile Networks -> Network Operators
when selecting this option I only see Iusacell 4G and Nextel 3G (the others companies in the country) and, very often from Telcel, and when I select it (with a Telcel sim inside ), it says: Registering in Telcel,then throws an error saying that it can not register the signal.
in:
Settings -> Mobile Networks -> APN, has Telcel Edge selected, and Telcel MMS configured already.
The rom that was installed doing the tutorial that I put is:
CyanogenMod version
11.0-XNPH30O
Android vesion
4.4.4
Kernel version
3.4.0-cyanogenmod-g7389215 build04 @ cyanogenmod # 1 Mon Aug 11 15:50:37 PDT 2014
What do I need to do to get the sim's signal? Can someone help me please?:crying:

Deleted

Noticed sim problems on my one plus one 4G and 3G running an Oreo ROM and using FreedomPop. It works and can connect as normal, but call quality is pretty poor and probably unrelated. Curious if anyone has similar poor call quality? Sorli....
Sent from my [device_name] using XDA-Developers Legacy app

nobody?

capulina said:
Hi there!! Well my one plus one had the problem of the continuous restart, and solve it, following the steps of the htcmania tutorial from reboot (i am new so xda doesnot allow me to post outside links)
Everything is perfect, everything works again. The problem: It does not detect the Telcel sim. I am from Mexico ,by the way.
In Settings -> Mobile Networks -> Preferred Network Type, select 3G (if I select LTE does not recognize anything), then:
Settings -> Mobile Networks -> Network Operators
when selecting this option I only see Iusacell 4G and Nextel 3G (the others companies in the country) and, very often from Telcel, and when I select it (with a Telcel sim inside ), it says: Registering in Telcel,then throws an error saying that it can not register the signal.
in:
Settings -> Mobile Networks -> APN, has Telcel Edge selected, and Telcel MMS configured already.
The rom that was installed doing the tutorial that I put is:
CyanogenMod version
11.0-XNPH30O
Android vesion
4.4.4
Kernel version
3.4.0-cyanogenmod-g7389215 build04 @ cyanogenmod # 1 Mon Aug 11 15:50:37 PDT 2014
What do I need to do to get the sim's signal? Can someone help me please?:crying:
Click to expand...
Click to collapse
Curious what baselines have you tested. For instance, my One Plus One uses GSM and that means I can use anyone's SIM card and from other providers to see if my problem is SIM specific (faulty sim card, sim slot failure, or installed upside down).
Do you have friends who Sims work that you can install in your phone and test your phone hardware and software? Thankfully, I have wife and can easily swap SIM cards and test my configuration quickly. Worth seeing what you get and this should help baseline your configuration.
Side note, found my cell problems and lack of signal related specifically to the building (metal roof, concrete walls) and I'm actually shocked how different phones using same service get such different call quality. I'm not talking bout huge differences in smartphones and one phablet having larger antennas compared to another. All are about the same and performance simply fluctuates depending on location. Nothing knew here and I personally can't use my smartphone in buildings unless they're using Verizon or similar services.
Sorry for the long reply, but maybe it will help you resolve your problem! Sorli...
Sent from my [device_name] using XDA-Developers Legacy app

If you are on kitkat 4.4, try updating to a nougat rom, this is really stable and updated:
https://forum.xda-developers.com/on...m-kernel-unofficial-lineageos-14-1-3-t3626403
BUT ATTENTION: this rom doesn't come with an updated modem, so also flash a newer modem firmware :
https://forum.xda-developers.com/oneplus-one/general/firmware-modem-oneplus-one-lollipop-t3300907
DI.3.0.c6-00241 - latest "stable" modem, try this first
4.0.1.c7-00011.zip - alpha modem, someone says it's better, others says that it causes problem, you have to try it yourself.
Hope this will fix your issue!