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[Q] Not Getting Network on a Particular SIM

This is by far the strangest problem I'm facing with my Nexus S
I've two SIM cards from two different networks. one is GSM 900 and anothe is GSM 1800
Both the SIMs are perfectly ok and functioning very well in my Nokia X2.
But one of the SIMs (GSM 900) is not getting any network in my Nexus S.
Interestingly I've been using this very SIM (GSM 900) in my nexus for last one month.
Just to give a background, I'm facing this problem when I flashed the latest 2.3.7 stock ROM.
I tried flashing other ROMs aswell...Currenyly I'm on MIUI...but no Luck ! And Yes, the Other SIM is working absolutely fine with my Nexus and fine with both the ROMS !
Please Help !

If I'm not mistaken I believe 2.3.7 is an update for nexus s 4g models only and not GSM. That is a very good chance as to why your network doesn't work.
Sent from my Nexus S 4G using Tapatalk

drtdiver83 said:
If I'm not mistaken I believe 2.3.7 is an update for nexus s 4g models only and not GSM. That is a very good chance as to why your network doesn't work.
Sent from my Nexus S 4G using Tapatalk
Click to expand...
Click to collapse
But it was Getting network. And My other SIM is getting network in that OS.
BTW, I've flashed a different ROM (MIUI)....No luck with the new ROM...

frequency base band problems perhaps ?

Yes, its Reading 1800 SIMs but not 900 SIMS.

all what you said so far indicates that the problem was caused by the new binary.
it seems the hardware is working fine.
what is the software version of your phone?
download an official version of Nexus S and you'll be fine.
tell me what you see in the "about phone"

Android Version: 2.3.5
Baseband Version: I9020XXKD1

Currently I'm in MIUI. Searching for the official version of 2.3.4

uralpongkhi said:
This is by far the strangest problem I'm facing with my Nexus S
I've two SIM cards from two different networks. one is GSM 900 and anothe is GSM 1800
Both the SIMs are perfectly ok and functioning very well in my Nokia X2.
But one of the SIMs (GSM 900) is not getting any network in my Nexus S.
Interestingly I've been using this very SIM (GSM 900) in my nexus for last one month.
Just to give a background, I'm facing this problem when I flashed the latest 2.3.7 stock ROM.
I tried flashing other ROMs aswell...Currenyly I'm on MIUI...but no Luck ! And Yes, the Other SIM is working absolutely fine with my Nexus and fine with both the ROMS !
Please Help !
Click to expand...
Click to collapse
2.3.7 is for the cdma nexus s 4g not a GSM model. Try reflashing the correct radios for your phone.
Sent from my Nexus S 4G using xda premium

I've tried Flashing Radios. But Yet its the same scenario !
Getting network with a GSM 1800 sim. Not with GSM 900 SIM (Unfortunately this is my official number)
Can anyone suggest the exact stock ROM for my sns. I tried to search here in XDA, but not finding the exact one.
the sticker in back says my SNS model is GT-I9020

Some files may stuck in /system partition when you flash something, and good idea is to format /system from CWM recovery (you can find it under mounts and storage section) and flash rooted flash rom from here - http://forum.xda-developers.com/showthread.php?t=1063664.
It's always a bad thing to flash something that is not meant for your device.
Formating /system before you flash stock rom. Hope that could fix your problem too, but I'm not sure . Just a suggestion ...

Mafia303 said:
all what you said so far indicates that the problem was caused by the new binary.
it seems the hardware is working fine.
what is the software version of your phone?
download an official version of Nexus S and you'll be fine.
tell me what you see in the "about phone"
Click to expand...
Click to collapse
I've flashed this from Google
http://android.clients.google.com/p...206299fe6.signed-soju-ota-121341.da820629.zip
Now my about phone looks like this :
Androd Version : 2.3.6
Baseband: I9020AUCKF1
Build No. GRk39C
Yet, its not getting network.
Should I take it that I've lost my Nexus.

Thanks for you reply Tenhi.
I tried formating Everything ! and also Flashed the Stcok ROM (NSGSM-GRJ22-deodexed-KD1-rooted)
But no Luck.
Interestingly, today I found that the set is getting network in Some places, mostly where the network strength is very strong. And functioning very well with GSM 1900 carriers. But facing the problem with GSM 900 carriers only.
Isn't there anyway to get back to Factory Settings or something like this...?

Don't know what else to say. Apparently the NS4G 2.3.7 ROM changed something permanently, and you can't reverse it with flashing another ROM/Radio/Kernel. Unfortunately I don't have any more suggestions . Hope you will find a way to fix it ...

Yet to get a way to fix it.
Strange problem I'm in.
Now looking for a nandroid backup. (Downloading this http://forum.xda-developers.com/showthread.php?t=1059914)
Lets see whether it solve the problem or not.
At this point I'm loosing hope...
Tenhi said:
Don't know what else to say. Apparently the NS4G 2.3.7 ROM changed something permanently, and you can't reverse it with flashing another ROM/Radio/Kernel. Unfortunately I don't have any more suggestions . Hope you will find a way to fix it ...
Click to expand...
Click to collapse

I had one Stock ROM backup (2.3.3). I flashed it today. Which updated the Radio to KB3 also.
But the problem persisted. Then I took the offcial update to 2.3.4 using the push update.
Yet the problem is not fixed. Not getting any clue on what happened !
I've tried two different operators who run GSM 900 and its not getting network with them.
But There is no problem with GSM 1800 operators. Its running smoothly with GSM 1800 SIM.

Alhamdulillah, the problem has been solved.
A OTA update to 2.3.6 has solved the problem for me.
First I flashed 2.3.3, just after flashing it prompted for a update to 2.3.4 and a day after it prompted for a update to 2.3.6.
Which eventually solved the problem
Thanks for your help guys.

[Q] Best radio version for using oversea ?

Hi,
I am using AT&T Samsung Galaxy S II Skyrocket in Viet Nam, not in USA, because i like the way this Skyrocket phone design so i ask some of my friend bought one for me from US. But i got som problem with this phone when using in my 3G network carrier Mobifone , 3G data connection sometime lost and sometime good . So anyone have exprience with this kind of thing ? What radio version i should use between :
Original Shipped AT&T Skyrocket Radio I727ATTKJ2 and RIL
Original Shipped Rogers I727RUXKJ7 Radio and RIL
AT&T 2.3.6 OTA Update Radio I727ATTKK1 and RIL
T-Mobile T989UVKL1
in this topic : http://forum.xda-developers.com/showthread.php?t=1384865
Best regards,

I've seen about oversea(europe) thread.
Please refer it.
http://forum.xda-developers.com/showthread.php?t=1377114
But I've one question.
Does your Skyrocket gps fix time is fast in your vietnam country?
Normally gps lock time is about 5~10 sec.
because, I will purchase skyrocket, but some of phones are using agps surver using
their own country.(for example, T-mobile G2x using T-mobile a-gps server,
So it will cause gps fix laggy)

Pulverizer said:
I've seen about oversea(europe) thread.
Please refer it.
http://forum.xda-developers.com/showthread.php?t=1377114
But I've one question.
Does your Skyrocket gps fix time is fast in your vietnam country?
Normally gps lock time is about 5~10 sec.
because, I will purchase skyrocket, but some of phones are using agps surver using
their own country.(for example, T-mobile G2x using T-mobile a-gps server,
So it will cause gps fix laggy)
Click to expand...
Click to collapse
thanks you
GPS fix super fast here. If the weather good it make take just a few second. I am trying flash T989 rom to see if anything better.

you're welcome.
I think overseas users make a thread.
Isn't it? hehe
I am very very wodner that compatibility to
AT&T ROM(727) , Rogers ROM(727R), T-mobile ROM(989) all models?
For example, I will use to Odin.
* If I have a i727 ATT Device,
1) flash to i727R ? not bricked?
2) flash to i989 ? not bricked?
If I get a i727 ATT device, I will flash i727 Rogers ROM.
Because AT&T have many pre-load apks. And too many customizing.

Pulverizer said:
you're welcome.
I think overseas users make a thread.
Isn't it? hehe
I am very very wodner that compatibility to
AT&T ROM(727) , Rogers ROM(727R), T-mobile ROM(989) all models?
For example, I will use to Odin.
* If I have a i727 ATT Device,
1) flash to i727R ? not bricked?
2) flash to i989 ? not bricked?
If I get a i727 ATT device, I will flash i727 Rogers ROM.
Because AT&T have many pre-load apks. And too many customizing.
Click to expand...
Click to collapse
Hi. yes. i think we can flash flash those rom to any of those kind of phone because it have same hardware.
I also hate those pre-load apks, i am downding some "nake" rom without any preload apks from t989 phone and flash to my t727 phone. i will let me know the result in nex 40 minute

i flash the Juggernaut rom from T989 from here http://forum.xda-developers.com/showthread.php?t=1322642 but it look like 3G data connection not so good.
I flash to NeXusM0Di727 here : http://forum.xda-developers.com/showthread.php?t=1426590 and so far everything work great. Very good rom

Thanks for very useful information.
I am wondet yet what I buy i727 or t989.
Its very confused hehe...
Sent from my LG-P990 using XDA App

For someone who are using this i727 oversea .
I'v tried all the radio but in the end this radio : T989UVKL1 is the best now . Very strong singal .
Here are download link : http://www.ponack.net/TPC/dagnarf/cwm-tmob-kl1-radio.zip
It make by Da_G

Thanks for very useful information.
I purchased White i727 skyrocket. Its very very beauty!!
I wonder that Can I Flash i727R(Rogers) rom via odin tool?
I try find rogers i727R CWM image(ZIP), but I can't find it.
AT&T stock rom have too many bloat app and Can't use wifi hotspot(its only use AT&T SIM).

ok now i have problem with T989UVKL1 !!! It look like my baseband DEAD !!!! I alway lost signal , can't sms or receive sms , can't call or receive call . I reflash my phone with stock AT&T rom via odin but still no luck . it look like T989UVKL1 radio did something wrong in my phone
HELPPPPPPPPPPPPPP ! ! !

I recommend thay you will make new thread about your baseband problem.
Sent from my LG-P990 using XDA App

Back to stock

Hi Guys,
My girlfriend have a Nexus S and I just flashed an ICS ROM and almost everything is fine, but shes complaining about radio performance. Everything was fine with gingerbread but now she gats poor signal from 3G network.
I dint have too much experience with the Nexus because I used a Galaxy S and now I have a Galaxy S II. With this models I can aways get completely back to stock using Odin.
I was just wondering with this is possible with the Nexus S, so I can put that smartphone back to stock and tell her to wait for que OTA update.
Sorry if this is a dumb question here but, you know, this kind of things changes a lot between different models of Android smartphones.

go here http://forum.xda-developers.com/showthread.php?t=1063664 and make sure you download for correct phone model and flash in cwm

http://forum.xda-developers.com/showthread.php?t=1116884
Or here to flash the radio you or she, had before
Sent from my Nexus S using xda premium

Change the Radio
what phone does she have? I9020T(t-mobile) or I9020a(AT&T) or I9023(international)?
usually ICS roms are coupled with the KI radio. Check if you have it in setting/about phone/baseband version
weak signals are usually caused by baseband/kernel. did you try flashing the stock ICS OTA?
My advice is just swap between KB3-KD1-KF1-and KI1
you might have stronger signal with one of them depending on your region.
Hope I helped

Hi guys!
Thanks a lot for the tips. I'll try to fix the signal thing first and if I can't I'll put the phone back to stock and wait for the OTA update.
Her Nexus S is a I9020a we bought in a travel to Canada and it worked ok in Brazil before flashing the ICS ROM.

Ticiano said:
Hi guys!
Thanks a lot for the tips. I'll try to fix the signal thing first and if I can't I'll put the phone back to stock and wait for the OTA update.
Her Nexus S is a I9020a we bought in a travel to Canada and it worked ok in Brazil before flashing the ICS ROM.
Click to expand...
Click to collapse
The rom you have flashed contains the KI radio(works only on i9020t and i9023) and the rom itself also maybe incompatible for i9020a.
My advice is :
1-to download this ROM(its great)
http://forum.xda-developers.com/showthread.php?t=1397358
2- download the new UCKF1 radio for i9020a:
http://forum.xda-developers.com/showthread.php?t=1116884
follow the steps for installing the rom found in the same thread(including wipes and Gapps)
after flashing, dont restart you phone, flash the UCKF1 radio, wipe dalvik and then reboot.
you should be ok
Ps. even if you flash back to stock it will not work, because the .Zip stock roms on XDA are all OTA and do not contain radios as I recall, just a Rom. If you happen to revert back to gingerbread stock, make sure you flash the radio too

Hi guys,
I liked the idea of flashing a stock rom for the i9020a again, but this stock ROMs are coming in a .tar package that I just cant flash using CWM.
I really sorry for this dumb questions, but I'm used to deal with stock ou custom ROMs with the Galaxy S and now with the Galaxy S II. With this models I just flash a stock ROM with Odin when I want to go back to stock. I don't know how to do this with the Nexus S and I couldnt find that newbie guide using the search. Sorry.

Ticiano said:
Hi guys,
I liked the idea of flashing a stock rom for the i9020a again, but this stock ROMs are coming in a .tar package that I just cant flash using CWM.
I really sorry for this dumb questions, but I'm used to deal with stock ou custom ROMs with the Galaxy S and now with the Galaxy S II. With this models I just flash a stock ROM with Odin when I want to go back to stock. I don't know how to do this with the Nexus S and I couldnt find that newbie guide using the search. Sorry.
Click to expand...
Click to collapse
Check this
http://forum.xda-developers.com/showthread.php?t=1575502
its for NS 4g, but should involve the same steps. Just use the NS files instead.
You need to have:
1-the Firmware TAR file
2-Bootloader file
3-Modem File
Best of luck

[Q] i727 on T-Mobile with Edge

Hey all,
I've been using my i727 Skyrocket unlocked on T-Mobile. But it has always been on Edge network for me. I read that this phone does not support T-Mobile band 1700/2100 so that's why it cannot have 3G/4G. Anyone in the same boat as me whose figured out how to get it working? Perhaps with a radio flash?
Thank you for reading!

johnnysyeah said:
Hey all,
I've been using my i727 Skyrocket unlocked on T-Mobile. But it has always been on Edge network for me. I read that this phone does not support T-Mobile band 1700/2100 so that's why it cannot have 3G/4G. Anyone in the same boat as me whose figured out how to get it working? Perhaps with a radio flash?
Thank you for reading!
Click to expand...
Click to collapse
It will depend on if you have an ICS or GB rom running currently. I have the I727 CM9 (ICS) unlocked/rooted on TMO too, and was able to finally get off edge running the Tmo_SGH-T879-UVLG3_radio.zip. Get 3G most of the time, and occasional HDSPA.
Make sure you have the stock radio before you do anything and make a back-up to be safe. Move the file to your sd card and load via CWM recovery.
If you are on a GB version I cannot help you, sorry.
Best of luck.

captainmycaptain said:
It will depend on if you have an ICS or GB rom running currently. I have the I727 CM9 (ICS) unlocked/rooted on TMO too, and was able to finally get off edge running the Tmo_SGH-T879-UVLG3_radio.zip. Get 3G most of the time, and occasional HDSPA.
Make sure you have the stock radio before you do anything and make a back-up to be safe. Move the file to your sd card and load via CWM recovery.
If you are on a GB version I cannot help you, sorry.
Best of luck.
Click to expand...
Click to collapse
I'm currently working on getting Sky-ICS on my phone. After I successfully put it in, I will try the radio you mentioned. Gotta look for
That radio to download first
Thanks a lot for your help!

[GPS ISSUE] HTC One M8 VZW - & CM12 based ROMs

First of all, this issue isn't just gonna get fixed by flashing a Sense-based ROM, then going back to CM12. This goes deeper than that...it seems to be working fine for guys running the same ROM with TMO and other carriers.
What does anyone know about GPS not being able to communicate with GPS satellites when running most CM12 ROMs with Verizon's 4.4.4 firmware on your M8? Could this be kernel related? Is it that Verizon 4.4.4 firmware (CDMA) is conflicting with something? Any input would be appreciated. Thanks!

same issue on Sprint m8
calebcabob said:
First of all, this issue isn't just gonna get fixed by flashing a Sense-based ROM, then going back to CM12. This goes deeper than that...it seems to be working fine for guys running the same ROM with TMO and other carriers.
What does anyone know about GPS not being able to communicate with GPS satellites when running most CM12 ROMs with Verizon's 4.4.4 firmware on your M8? Could this be kernel related? Is it that Verizon 4.4.4 firmware (CDMA) is conflicting with something? Any input would be appreciated. Thanks!
Click to expand...
Click to collapse
I just flased to CM 12 Nightlies and my GPS lost as well. The GPS worked great on stock kit Kat.

calebcabob said:
First of all, this issue isn't just gonna get fixed by flashing a Sense-based ROM, then going back to CM12. This goes deeper than that...it seems to be working fine for guys running the same ROM with TMO and other carriers.
What does anyone know about GPS not being able to communicate with GPS satellites when running most CM12 ROMs with Verizon's 4.4.4 firmware on your M8? Could this be kernel related? Is it that Verizon 4.4.4 firmware (CDMA) is conflicting with something? Any input would be appreciated. Thanks!
Click to expand...
Click to collapse
That does fix the issue for a lot of people and is recommended across devices when trying to get a GPS lock on an aosp Rom (example: vzw note 2) also, some people have to do it a couple times before it works. If it still isn't working for you you can try a clean flash to stock sense get the lock etc, and then copy gps.conf from /system/etc, restore your bAckup of cm12 and paste it in the same place (back up the original first), set perms to 644, reboot and hope for the best

GPS not working on HTC one m8
calebcabob said:
First of all, this issue isn't just gonna get fixed by flashing a Sense-based ROM, then going back to CM12. This goes deeper than that...it seems to be working fine for guys running the same ROM with TMO and other carriers.
What does anyone know about GPS not being able to communicate with GPS satellites when running most CM12 ROMs with Verizon's 4.4.4 firmware on your M8? Could this be kernel related? Is it that Verizon 4.4.4 firmware (CDMA) is conflicting with something? Any input would be appreciated. Thanks!
Click to expand...
Click to collapse
Just so I said it, I've got the same issue on the sprint version.

Lost GPS
I did as you suggested and tried Skyfire. The gps worked But no service or mobile data (waa waa). I made a copy of the ect/gps file and replaced it once I flashed back CM 12. Un fortunatly that didn't do the trick. Thanks for the suggestion though.