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[Q] Why can't i get data connection after flashing a new ROM?

I have a Koodo Nexus S on rogers currently running CM 7.0.3. I have had the urge to flash a few ROMS and i have done so unsuccessfully. Every time i flash a ROM i lose my data connection.
I flash back to stock, i lose my data connection. It shows that i have a UMTS (3G) connection but no data can be transfered.
I double check my APN's every time i flash but i always have to nandroid back to CM to get the phone to work properly.
I have also flashed and got the carrier to reprovision my data to no avail...can someone help me out? Perhaps the build.prop file?

have you tried manually re-creating the APN settings?
the ones from backup might be corrupted?

AllGamer said:
have you tried manually re-creating the APN settings?
the ones from backup might be corrupted?
Click to expand...
Click to collapse
Yes sir. I delete the default ones that come with the ROM be it factory or custom ones and replace them with what works with my CM nandroid. My network state shows connected. In the 4636 dialer menu it also shows connected but the ping fails and i cannot browse or setup an account.

Anyone got any ideas?
Sent from my Nexus S using XDA Premium App

No 4G at all

I have an s3 that I flashed to CM10, AOKP 6 and I also tried synergy. I cannot seem to get LTE on the first 2 adn with synergy, I can only get it by using the phone info thing and switching to an LTE ONLY mode. I noticed when I was stock I didnt see it going to LTE either. is this a problem with it switching over or what? When I try to switch to the LTE ONLY mode on the other 2 roms, I get no connection at all.
Any ideas? Is the phone toast? I am an experienced flasher, as I am coming from a galaxy nexus lte and am a crack flasher. Before each rom, I wiped data, cache, dalvik and system.
anyone have ideas? I am at a loss.
thanks
edit: I also noticed that on CM10 and AOKP the activation fails, and I can skip it. My phone number shows up as unknown but I have an IMEI number

*#*#4636#*#*
Change to CDMA/LTE Auto

I did that and I noticed no change. I only have 3g

SAME THNG!!
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
dougmod said:
i did that and i noticed no change. I only have 3g
Click to expand...
Click to collapse

e-zzy1 said:
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
Click to expand...
Click to collapse
i had to get a new sim card. i went to the store and the new sim fixed it all

dougmod said:
i had to get a new sim card. i went to the store and the new sim fixed it all
Click to expand...
Click to collapse
I'm having the same problem, I think. When I switch to an LTE option in phone info, it doesn't stay that option. it goes back to CDMA auto.
Can you just go to the verizon store and ask for a new one? Do they need to see your phone or anything like that, that will tell them its rooted?

raisins said:
I'm having the same problem, I think. When I switch to an LTE option in phone info, it doesn't stay that option. it goes back to CDMA auto.
Can you just go to the verizon store and ask for a new one? Do they need to see your phone or anything like that, that will tell them its rooted?
Click to expand...
Click to collapse
I was afraid and flashed back to stock before taking it in, but the sim card thing is common. so just say you were told by customer service to come in and get a new sim and they will set you up. if you dont feel like going to the store, customer service will overnight you one, pretty much no questions asked. so its no big deal

This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3

DROID3R said:
This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3
Click to expand...
Click to collapse
after flashing back through odin, I still had only 3G

DROID3R said:
This is a common problem... i had it too with synergy 1.2. The phone info app was stuck gets stuck on cdma . I had to flash the stock image through odin and flash synergy again. No new sim cards are required
VERIZON GALAXY S 3
Click to expand...
Click to collapse
When you do that, do you wipe all your data?

raisins said:
When you do that, do you wipe all your data?
Click to expand...
Click to collapse
Check your baseband then head to
http://forum.xda-developers.com/showthread.php?t=1788313 then flash a different radio.. meaning if you running LF2 then flash LG1 and vice versa. After i changed the modem i boot up into 3g went into phone info and chose lte only and 4g turned on.
When it happened to me i was running synergy (LG1-radio)...jellybomb theme..so there must be an issue there . i think its the jellybomb theme since it was made for sprint users
VERIZON GALAXY S 3

e-zzy1 said:
I have the same problem and can't seem to find a solution!!!!
I have two s3 and they both do the same thing!!!
Click to expand...
Click to collapse
Pop up dialer, type *2767*3855#
and it will reset your 4G by fixing the SIM card - and immediately reboot. I've had the problem twice, and both times this key sequence fixed it. :highfive:

So a friend of mine was having the same issue. No 4G in an area I know he has full 4G signal. I reflashed the unrooted stock image in Odin (he was already stock, rooted, unlocked with cwm 6.xx) and still no dice. I tried flashing both radios, no dice. Also tried the dialing above to reset everything, nothing. Finally I gave up and told him to take it in into a store and they replaced the sim card and it worked! We then rerooted, unlocked, flashed cwm and all was good.
However, I asked him what all he had originally done after getting the phone so that we could try to take it step by step and see what caused it. I installed TiBu and lucky patcher as he had previously done (I don't condone pirating, espeically this great app but I wanted to try and recreate the issue) and it broke it, no 4G! I think the culprit was lucky patcher; I highly doubt TiBu could cause it as I have had no trouble with it. Only other rooted app he installed was adblock but again, I use this all the time with no troubles. I told him to just pay for the app! But I am still interested if anyone else might have had the same issue so we could try to prevent it for others? Any of you above who lost 4G did you by chance use lucky patcher?
Edit: Also, i noticed that I put the phone in 4G LTE only mode using phone info the 4G LTE symbol pops up but there are no signal bars. However, it appears as if there is signal since data speeds work fine and at normal LTE for this area so just the bars are screwed up, and then something with the hand off when switching back to normal off LTE only? Anyone else exeriencing this or have you tried to see if you actually have LTE even though you have no bars?

Same crap on my white 16gb gs3. Ridiculous data connections.
---------- Post added at 03:50 AM ---------- Previous post was at 03:42 AM ----------
I have a replacement coming. They sent it a week ago and I got it yesterday and they sent me a nexus. Maybe its a sign to go back to the good ol gnex. They resent a gs3 so if the new one doesn't fix it I'm going to keep the gnex they sent and cut my loss
Sent from my SCH-I535 using xda app-developers app

i727 No Mobile Data

Hi,
I don't own this device, but a colleague who does asked for my help. We're in Africa(Ghana to be precise), and he got his i727 from a pal just in from the US. It was used when he got it, unlocked in the US and apparently he'd used it in the US to be sure it was working fine. However in Ghana it has never successfully connected to mobile data. All it does is calls/sms and Wifi. When he handed it to me it was on stock ICS, so I updated to stock JB via Kies hoping it'd make a difference but no luck. Absolutely no data connection and it has been tried on the 2 most prominent networks here with APN settings correctly set. I'm stumped, anyone have a different idea?
PS: 3G in Ghana is on UMTS 2100Mhz which is apparently supported on the phone
Baseband version:UCMC1

Any ideas at all would be great guys.. I read some posts about 3G data not working outside the US unless it's an AT&T sim, but others said they never had problems using it on 3G networks in Europe and Taiwan.
Sent from my SGW powered by CM10.1

wipe caches
factory reset
try *#*#4636#*#*
try a different radio but that might not work on att jb stock firmware
try rogers ics or jb stick firmware howto here http://forum.xda-developers.com/showthread.php?t=1652398 then change your apns
idk what else you could try

vincom said:
wipe caches
factory reset
try *#*#4636#*#*
try a different radio but that might not work on att jb stock firmware
try rogers ics or jb stick firmware howto here http://forum.xda-developers.com/showthread.php?t=1652398 then change your apns
idk what else you could try
Click to expand...
Click to collapse
Thanks, I've tried most of the suggestions except
1)factory reset/wipe cache since he's not rooted and I wanted to fix this without rooting if possible
2)I tried the short code *#*#4636#*#*, it doesn't help much except showing that there's no connection to the data network. Selecting different preferred network types doesn't change anything. Any else I should do here?
3)Flashing different radios, I'm going to do this next, I'll flash the JB Rogers radio since I was saw it's RAT unlocked, not sure if that would make a difference but perhaps there's a service mode option which will do the trick. At the moment I've upgraded from stock ICS ROM/radio to the JB one and the data issue isn't fixed. Phone won't be used on AT&T anymore so doesn't matter.
APN's are correct, been rechecked lots of times
Sent from my SGW powered by CM10.1

2g11 said:
Thanks, I've tried most of the suggestions except
1)factory reset/wipe cache since he's not rooted and I wanted to fix this without rooting if possible
2)I tried the short code *#*#4636#*#*, it doesn't help much except showing that there's no connection to the data network. Selecting different preferred network types doesn't change anything. Any else I should do here?
3)Flashing different radios, I'm going to do this next, I'll flash the JB Rogers radio since I was saw it's RAT unlocked, not sure if that would make a difference but perhaps there's a service mode option which will do the trick. At the moment I've upgraded from stock ICS ROM/radio to the JB one and the data issue isn't fixed. Phone won't be used on AT&T anymore so doesn't matter.
APN's are correct, been rechecked lots of times
Sent from my SGW powered by CM10.1
Click to expand...
Click to collapse
stock recovery has wiping and resetting options iirc.
root has nothing todo with wiping/reseting , you need todo more reading

No LTE

Hello!
I was running CM11 7/17 build and randomly my phone lost all phone service. Or so it seemed. So it seemed. I was able to call *228 to try to update roaming service. Well, it worked, except now, my phone stays in 3G and still doesn't seem to be full strength. Does anyone know what I need to do.
Also, I've updated to 7/27 CM11 and that didn't change anything service wise.
Thank you!

ESCollins90 said:
Hello!
I was running CM11 7/17 build and randomly my phone lost all phone service. Or so it seemed. So it seemed. I was able to call *228 to try to update roaming service. Well, it worked, except now, my phone stays in 3G and still doesn't seem to be full strength. Does anyone know what I need to do.
Also, I've updated to 7/27 CM11 and that didn't change anything service wise.
Thank you!
Click to expand...
Click to collapse
im pretty sure you dont want to use 228 on a smart phone, its not like a dumb phone that needs updates like that.
i would put stock on and see if you still have the issue.
if that doesnt fix it, or you dont want to do that, i would get a new sim card and see if that helps. you may have burned the 4g out of the sim.

bweN diorD said:
im pretty sure you dont want to use 228 on a smart phone, its not like a dumb phone that needs updates like that.
i would put stock on and see if you still have the issue.
if that doesnt fix it, or you dont want to do that, i would get a new sim card and see if that helps. you may have burned the 4g out of the sim.
Click to expand...
Click to collapse
Stock works fine. And I had this problem before when I used a locked boot loader ROM. But when I upgraded to KitKat and unlocked the boot loader and tinstalled CM11 everything was fine.
Is there a way to reset my phones cell/data service back? Instead of Verizon Wireless it just says T-CDMA 64 now as well.

ESCollins90 said:
Stock works fine. And I had this problem before when I used a locked boot loader ROM. But when I upgraded to KitKat and unlocked the boot loader and tinstalled CM11 everything was fine.
Is there a way to reset my phones cell/data service back? Instead of Verizon Wireless it just says T-CDMA 64 now as well.
Click to expand...
Click to collapse
i dont know exactly, i can only say what i would try if i were in your situation.
first i would re-flash the rom, just wipe cache's and system.
if no fix, i would try re-flashing only the modem's. edit the stock xml file and dump every line except the modem's and modem wiping lines then flash with rsd.
if no fix, i would have to say, a full wipe and re-install of the rom is in order.
if that dont fix it, i dont know what else to try.
i would do a backup before you try any of that, although its mostly useless, as you would just be backing up the broken setup. would just help to recover any data if you need to.

bweN diorD said:
i dont know exactly, i can only say what i would try if i were in your situation.
first i would re-flash the rom, just wipe cache's and system.
if no fix, i would try re-flashing only the modem's. edit the stock xml file and dump every line except the modem's and modem wiping lines then flash with rsd.
if no fix, i would have to say, a full wipe and re-install of the rom is in order.
if that dont fix it, i dont know what else to try.
i would do a backup before you try any of that, although its mostly useless, as you would just be backing up the broken setup. would just help to recover any data if you need to.
Click to expand...
Click to collapse
Okay. That was what I was fearing. But I'll give it a try when I get home! Thanks!!

I had the same problem, and I ended up getting a new SIM card. That fixed the problem, but I don't know if that was the only way to fix it...
Sent from my DROID RAZR HD using XDA Free mobile app

No cellular connectivity whatsoever

So I've been flashing back and forth and restoring nandroids the entire day trying to troubleshoot and get xposed to work for 5.1. As of now, I've lost all cellular connectivity as in no cell service at all. Thought it may be my sim but I tried it out on my old Xperia Z1s and it works fine, sent text and tried downloading something from play store. Both worked fine so it's not the sim card (Tmo). I've been flashing and restoring both CM12 (last one available through the updater) and CM12.1 (4/18 nightly and just now 4/19 to try). Wifi works fine but there's no cellular signal/service. It's not acting as if there's no sim, it's acting as if there's no service at all, not even emergency cell signal. My guess is my modem is fried so I tried to flash the latest modem from XNPH44S but that didn't work either. I've searched the forums and googled but no one seems to have my exact issue. Most were either of stuck airplane mode or issues with APN settings. I'd be more relaxed if those were my issues as I'm really hoping I didn't fry my modem (hardware) flashing back and forth all day. Any suggestions?

gqukyo said:
So I've been flashing back and forth and restoring nandroids the entire day trying to troubleshoot and get xposed to work for 5.1. As of now, I've lost all cellular connectivity as in no cell service at all. Thought it may be my sim but I tried it out on my old Xperia Z1s and it works fine, sent text and tried downloading something from play store. Both worked fine so it's not the sim card (Tmo). I've been flashing and restoring both CM12 (last one available through the updater) and CM12.1 (4/18 nightly and just now 4/19 to try). Wifi works fine but there's no cellular signal/service. It's not acting as if there's no sim, it's acting as if there's no service at all, not even emergency cell signal. My guess is my modem is fried so I tried to flash the latest modem from XNPH44S but that didn't work either. I've searched the forums and googled but no one seems to have my exact issue. Most were either of stuck airplane mode or issues with APN settings. I'd be more relaxed if those were my issues as I'm really hoping I didn't fry my modem (hardware) flashing back and forth all day. Any suggestions?
Click to expand...
Click to collapse
Try restoring via fastboot for a clean slate. I understand from your post that you're flashing via custom recovery.

gqukyo said:
So I've been flashing back and forth and restoring nandroids the entire day
Click to expand...
Click to collapse
CM12.1 may flash the new radio that OxygenOS flashes, from which there is not necessarily an immediate return.
Possible you have that new radio. See here:
https://forums.oneplus.net/threads/oxygenos-back-to-cm11s.296219/#post-10851703

gqukyo said:
So I've been flashing back and forth and restoring nandroids the entire day trying to troubleshoot and get xposed to work for 5.1. As of now, I've lost all cellular connectivity as in no cell service at all. Thought it may be my sim but I tried it out on my old Xperia Z1s and it works fine, sent text and tried downloading something from play store. Both worked fine so it's not the sim card (Tmo). I've been flashing and restoring both CM12 (last one available through the updater) and CM12.1 (4/18 nightly and just now 4/19 to try). Wifi works fine but there's no cellular signal/service. It's not acting as if there's no sim, it's acting as if there's no service at all, not even emergency cell signal. My guess is my modem is fried so I tried to flash the latest modem from XNPH44S but that didn't work either. I've searched the forums and googled but no one seems to have my exact issue. Most were either of stuck airplane mode or issues with APN settings. I'd be more relaxed if those were my issues as I'm really hoping I didn't fry my modem (hardware) flashing back and forth all day. Any suggestions?
Click to expand...
Click to collapse
Can you still see your baseband and IMEI? Go into Settings/About Phone for the baseband version and Settings/About Phone/Status for the IMEI.
Transmitted via Bacon

Baseband is unknown and there's no mention of IMEI anymore... does that mean I lost my IMEI/it got corrupted? Am I screwed? I planned on trying the fastboot restore but only as one of the last resorts. If CM12.1 use the same radio then my 12.1 should work but that doesn't either. Nothing works. I've tried CM11s, CM12, CM12S, CM12.1... sigh...
I think I had a modem/efs backup in one of my nandroids and I tried restoring that too with no luck
Restored one of my CM12 nandroids and now I have a baseband of "DI.3.0.c6-00230-M8974AAAAANAZM-1". For some reason or another, that doesn't look right to me even though I've never really paid attention to what the baseband ever listed. Still can't seem to locate my IMEI #. I did the #*#*4636*#*# and the cell radio is on and turning it off and one still only shows emergency calls only. Obviously I'm not going to try to call 911 just to test if the radio gets service. However, I can see my IMEI # so I guess that's good. I must have some bad firmware update. Guess I'll copy out all my stuff to my otg usb and fastboot restore and see if that helps unless there's something else I can try.... please let me know...

gqukyo said:
Baseband is unknown and there's no mention of IMEI anymore... does that mean I lost my IMEI/it got corrupted? Am I screwed? I planned on trying the fastboot restore but only as one of the last resorts. If CM12.1 use the same radio then my 12.1 should work but that doesn't either. Nothing works. I've tried CM11s, CM12, CM12S, CM12.1... sigh...
I think I had a modem/efs backup in one of my nandroids and I tried restoring that too with no luck
Restored one of my CM12 nandroids and now I have a baseband of "DI.3.0.c6-00230-M8974AAAAANAZM-1". For some reason or another, that doesn't look right to me even though I've never really paid attention to what the baseband ever listed. Still can't seem to locate my IMEI #. I did the #*#*4636*#*# and the cell radio is on and turning it off and one still only shows emergency calls only. Obviously I'm not going to try to call 911 just to test if the radio gets service. It really does look like it's my IMEI # that got jacked... what can I do now?.... :T
Click to expand...
Click to collapse
You've got a corrupt EFS partition. There's a thread detailing how to fix your situation in our general section.
Transmitted via Bacon

tried to flash the persist.img from http://forum.xda-developers.com/oneplus-one/help/fix-brickloop-audio-fx-fc-efs-corrupt-t2879061 but that just prevents my phone from booting up properly. I only see the OnePlus logo with not Powered by Android on the bottom...
I take it back, it does show the powered by android but only for a split second then it stays on the OnePlus logo and doesn't do anything... :T
Restored back most recent cm12.1 nandroid and now I do see IMEI number in the about settings but still only emergency calls only... Guess its a good start, no sure what else I can do at this point.

Now you see your imei but you dont have the signal,it means your modem file does not work.So the first thing to do is backing up the efs then you can flash 44s modem and proximity patch.Probably it will work.It worked for me.

Ok there may be hope then. Just flashed the 44s modem then nandroided back to my CM11s then flashed modem again just in case lol. Don't recall seeing a proximity fix but it's ok as long as my cellular connectivity works, I'll deal w/ other issues later. Otherwise all I have is an expensive media player... lol it's booting up now so we'll see... *fingers crossed*
Nope didnt work...going to try a fresh CM12 install...
Trying to flash roms and in the wizards it always states I don't have a sim installed so I'm not sure it's my modem that's messed up or if it's something else related to hardware related to the sim. The sim itself works in my other phone... tried a different sim and it's still emergency calls only. don't know what to do now. doing all this and it's still not working so I doubt even the fastboot restore would work... might just have to rma... which would probably take 4eva...

Pls flash your nandroid backup which gave you the imei first,after gain your imei ,back up it,then you can flash what rom you like,if you dont have your imei,just flash your imei backup.The most important thing is to back up your efs.
Sent from my A0001 using XDA Free mobile app

Think my efs is fine as I can see the IMEI now but no matter what nandroid and fresh install I try, I can't get the cellular connectivity to work. I backed up all partitions just in case.

gqukyo said:
Think my efs is fine as I can see the IMEI now but no matter what nandroid and fresh install I try, I can't get the cellular connectivity to work. I backed up all partitions just in case.
Click to expand...
Click to collapse
Being able to see your IMEI doesn't necessarily mean your EFS is ok.
Transmitted via Bacon

Well tried the persist.img but that didn't work so what else can I do?

The one thing that would definitely fix your issues would be if you had an EFS backup. I don't know why people don't do this. Without that I have no idea what you can do.
Transmitted via Bacon

Never had that issue before and I've own android phones from the HTC Hero. Lesson learned though, thankfully it's still under warranty and it's not that expensive a phone...

gqukyo said:
Never had that issue before and I've own android phones from the HTC Hero. Lesson learned though, thankfully it's still under warranty and it's not that expensive a phone...
Click to expand...
Click to collapse
Not all Android phones employ an EFS partition. I'd never heard of it before this phone but a bit of research on my part revealed the importance of an EFS backup.
Transmitted via Bacon

That would make sense then. As I was reading about EFS, seems like it was mostly Samsung phones. I guess I can try a fastboot restore... nothing else to lose. lol
Doh! apparently there is something to lose when fastboot restoring... phone stopped booting back up correctly after a few fastboot restores and now it won't even turn back on... lovely... at least I had a expensive android media player before, now I have a brick... lol

Edited - Sorry

I have the same issue with all verisons of CM12. I get No service. Although the XNPH44S radio was the best. Meaning I could atleast see 3-4 bars for about 1 second and then off for a couple of minutes and then back on again for 1 second and so on. I believe it is a problem with not having a proper radio. One plus should release a better working radio in my opinion. I am on PTEL Mobile network (uses T-Mobile). So until we get a good working version of the radio I think some people like us are stuck on cm11.