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AT&T Tab will no longer connect to AT&T data

I bought an AT&T Galaxy Tab. I confirmed when I received it, data worked, and then discontinued my service.
In the meantime I flashed to Overcome ROM, flashed to JPD to enable phone calls, brought it to Canada and used it there with a Canadian GSM provider, and now am trying to reconnect my AT&T service.
I activated my AT&T service about an hour ago, and everything seemed to be fine. I received the welcome to AT&T text message. However, it just won't connect to any data of any sort.
I've reflashed the modem to JPA, which I've seen people say works on AT&T, without any change.
I've installed the AT&T data usage widget, and it says "No Network Available or SIM could not be verified".
My APN settings by default were set with everything normal except for an empty password compared to what I found online. I tried setting a password and no effect.
Under Settings => About device => Status it shows Mobile network state as either Disconnected or Connecting.
Settings => Wireless and network => Mobile networks => Use packet data is unchecked, and whenever I try and change it, it will change to "Turning on..." and then after a few seconds it will change back to unchecked.
All of the Samsung related data connection toggles like on the pull-down windowshade or on the long press of power act like they're changing something instantly, but have no effect.
Anyone have any ideas on what's gone wrong here?

Someone stated earlier that their tab was kicked off of the network as well. I would try a series of restarts to see if the problem persists. If it does, try contacting at&t directly.
I Haz 3D!

knowledge561 said:
Someone stated earlier that their tab was kicked off of the network as well. I would try a series of restarts to see if the problem persists. If it does, try contacting at&t directly.
I Haz 3D!
Click to expand...
Click to collapse
I've restarted it about a million times in the past hour. I'll give contacting AT&T a try, hopefully it won't come up that I'm missing something from the stock ROM.

Called AT&T, they knew absolutely nothing, and couldn't help at all.
I suppose I'll try flashing a few more modems, including stock, and then I suppose I might have to reflash to completely stock if that doesn't fix it.

Try the sim card in another phone. They might not have apportioned it correctly.
Any modem will get you at least voice and EDGE, so don't worry about that now.
I have wap.cingular apn for a voice and data plan.

rangercaptain said:
Try the sim card in another phone. They might not have apportioned it correctly.
Any modem will get you at least voice and EDGE, so don't worry about that now.
I have wap.cingular apn for a voice and data plan.
Click to expand...
Click to collapse
Hmm I'll see if I can dig something up. However, I'm a little unclear on what will happen because this is the $15 AT&T Tablet data plan, and at best I might be able to scrounge up a phone.
The sim card automatically entered wap.cingular apn on my tablet plan as well.

I was soo excited when I found this thread. This is clearly my situation exactly:
http://forum.xda-developers.com/archive/index.php/t-1083173.html
I was using the voice APN on a data plan. I deleted all the old APNs, created a new one that is just Broadband/Broadband for name/APN. Rebooted.
Hit connect, and.....it's still screwed up. Now it flickers back and forth on the status page between Connecting and Connected, and the status bar up top reflects the same - I'll see the H with arrows for a half second, and then it'll disappear again.
On the Mobile networks page, Use packet data now similarly flickers between checked on its own and unchecked and gray.

Okay, no idea why, but everything works now.
After Broadband failed to work, I tried changing it to APN Broadband. That didn't work either, so I changed it back to Broadband. Things then started semi-working in that the connection was still flickering on and off, but when it was on, data was actually being transferred.
I rebooted, and now it's fully working. Hope it stays that way. Seems to shift back and forth between H and 3G a lot considering I'm in the middle of a city with full bars not moving, but other than that, all seems well.

It would have been good to know about 1,000 word ago you only have the $15 broadband sim!
Apn is: ATT BROADBAND, and nothing else.

rangercaptain said:
It would have been good to know about 1,000 word ago you only have the $15 broadband sim!
Apn is: ATT BROADBAND, and nothing else.
Click to expand...
Click to collapse
Hmm I have it set as Broadband, not ATT BROADBAND, and it's working for now so I ain't touch it.
Are people able to activate an AT&T Galaxy Tab on anything but the broadband sims?

Yes, I have voice and 3g data by ising a sim from my old android phone.

Cell connection dead on my T-Mo HTC One

I've got a rooted HTC One on T-Mobile that has worked fine for a couple months. Last week I got a SIM card error a few times and the cell connection was lost until I rebooted, at which point the SIM card error went away and the cell connection (voice and data) worked again.
As of yesterday, my cell connection is not working at all, no bars of service. I do not have a SIM card error displaying in my status bar either. Everything looks fine, just no cell service. It's not a network problem; my wife's phone works fine.
I've tried checking my mobile data settings and pulling and re-inserting my SIM card, but the problem still exists.
Fortunately WiFi works fine so I can still make calls when I have a connection, but obviously this is not sustainable. So... What do I do?
I'm rooted but running the stock ROM. Would it be worth it to flash and wipe? Really seems like a hardware issue to me. Do I have to contact HTC directly about warranty repair/replacement? How long does that process take and is my being rooted going to cause an issue?
Sad

sprocket87 said:
I've got a rooted HTC One on T-Mobile that has worked fine for a couple months. Last week I got a SIM card error a few times and the cell connection was lost until I rebooted, at which point the SIM card error went away and the cell connection (voice and data) worked again.
As of yesterday, my cell connection is not working at all, no bars of service. I do not have a SIM card error displaying in my status bar either. Everything looks fine, just no cell service. It's not a network problem; my wife's phone works fine.
I've tried checking my mobile data settings and pulling and re-inserting my SIM card, but the problem still exists.
Fortunately WiFi works fine so I can still make calls when I have a connection, but obviously this is not sustainable. So... What do I do?
I'm rooted but running the stock ROM. Would it be worth it to flash and wipe? Really seems like a hardware issue to me. Do I have to contact HTC directly about warranty repair/replacement? How long does that process take and is my being rooted going to cause an issue?
Sad
Click to expand...
Click to collapse
Get a sim card replacement and try that

[Q] no data connection

Hello.
Having problems with my I8190N. About 2-3 days a go it suddenly lost ability to connect into internet. I can switch data connection on or off, it doesnt make any difference. I have tried to reflash various ROMs and it's all the same, no internet. I get the usual signal bars but no H/G/E marks.
It did not happen after flashing, had CM11 on it for days and I could connect Internet just fine. No carrier limitations either, I can make calls out and same SIM in my old phone can go to internet.
Should I flash the stock ROM/bootloader back and RMA it? Or is there something else I can do? (perhaps known issue and solvable on my own)
Phone is fairly new, bought it in August as brand new.

i suppose APN settings are correct?
you can try to flash another baseband to try with it, what is yours current baseband?
basebands you can find here for N version, XXAMJ ist newest and working for me...

I had the same problem a couple of days ago. It turns out that my problem was the simcard, have you tried to put another simcard in your phone and see if it works?

I have this problem, same with two phones and two SIM cards, both phones are ZTE, both problem SIM cards are on Vodafone, both phones have no problem connecting to data via t mobile sim? This leads me to believe that voda data does not work on zte phones, apn details are correct. Does anyone knowa fix?
finally sorted it........... f'd around with a few different apn's and even phoned up talktalk(same as vodafone network) who confirmed I had the right settings which I hadnt!
Found the correct settings on the geeksquad website. seems i didnt need to bother filling out some of the fields and then wham internet connection straight away!
Sent from my ZTE V967S using xda app-developers app

VZW Moto X not going on 4G

so i came from my GNEX and needed to cut the SIM from micro to nano. came out damn near perfect. put the cut SIm in my moto x and it worked. 4G comes on and all is well for about a minute or i use my data in anyways. it will instantly drop down to 3G. Verizon did the whole "Restart and factory reset" BS and nothing helped. they tried a new sim and it wouldnt accept it.... what do i do

so now that you have a new SIM card. the phone wont read it at all so you have no data what so ever?

savini72 said:
... 4G comes on and all is well for about a minute or i use my data in anyways. it will instantly drop down to 3G....
Click to expand...
Click to collapse
I don't know much to help, but I noticed on my new Vzw Moto X that right after activation, my 4G light was on. I continued the setup and 4G turned off almost immediately. That was odd, but I was activating at home. I need to port in a number and visit a store, so I thought I would ask at that point. I was at home with WiFi. Anyway - I noticed that when WiFi is off, 4G is on. As soon as I turn on WiFi or connect to a WiFi access point, that 4G turns off. Could this be it?
- L

i have data and everything is working fine, but its only 3g. ive tried a new sim, hard reset, changing my data from global to 3g/4g adn all i can get its 3g.... i mean it works but jsut annoying

have you done any major changes to the phone recently?
if you haven't done any changes then sounds like there end not yours. only thing left you could try would be to use one of the restore to stock zips and try flashing it and see if that fixes it.that file contains all the modem's and so forth.
also like the other guy said are you connected to wifi and are you even sure you get 4G at your current location. i would restore my device to stock with the correct zip and see if that fixes it.

Wrong post

I'm going to just try Verizon again and if they can't fix it demand a replacement... Why have a 4g phone when it's not using It

so after 2 new SIMS and 4 factory restarts, the VZW rep fixed what was wrong. now, time to see how long my battery life is with 4G on!

savini72 said:
so after 2 new SIMS and 4 factory restarts, the VZW rep fixed what was wrong. now, time to see how long my battery life is with 4G on!
Click to expand...
Click to collapse
What'd it end up being?
Slapped my Moto

Lacrocious said:
I don't know much to help, but I noticed on my new Vzw Moto X that right after activation, my 4G light was on. I continued the setup and 4G turned off almost immediately. That was odd, but I was activating at home. I need to port in a number and visit a store, so I thought I would ask at that point. I was at home with WiFi. Anyway - I noticed that when WiFi is off, 4G is on. As soon as I turn on WiFi or connect to a WiFi access point, that 4G turns off. Could this be it?
- L
Click to expand...
Click to collapse
I have noted the same thing, and was curious.
Per VZW customer support today, that is normal operation.
The reasoning is as I expected:
Once you have a wifi connection (not just the wifi radio turned on), that connection will be responsible for data communications. The data capability of 4G is redundant, and the phone drops back to 3G operation to support phone only operations (voice, sms, e911, etc).
As I understand it, this should reduce both your battery usage, and of course VZW's tower's data load.

No Service(3g) SIM card is read by phone.

I goofed big time. Bricked my moto g yesterday trying to get myself lollipop. It was stuck in a bootloop of some sorts.
I came home after a long day, and quickly fixed it not really paying attention to what I was doing, everything worked fine, I could text use wifi, etc.
Woke up. Tired to install lollipop again, didn't even stop to think about a backup(got the phone yesterday) and now everything works... BUT my network... The phone reads that there is a SIM card, it just can't connect.
I had to revert back to "stock" following some post on here, can't remember exactly which, except it used mfastboot.exe.
Now I'm on 4.4.4 rooted with TWRP, and if it helps i have the xt1064 model.
I must say this phone has probably been thoroughly wiped in just two days
TL;DR Phone reads SIM card, wont connect to network, "no service" -- XT1064 rooted with TWRP -- 4.4.4
Edit: If I try to make a phone call it tells me to turn off airplane mode.
Edit: In about phone, I have a phone number and an IMEI number, but mobile network and mobile netowrk type are unknown and mobile network state is disconnected. Service state is radio off for voice and data.

It has been few days that I lost network connection (3g,+H....).
I see 3g crossed when I turn off data connection, but when I turn it on, nothing is happening..no internet connection, and no sign shown. I have dual sim Moto G. I have try factory reset and playing with aero mode, *#*#4636#*#* service code, nothing help me. Wifi working is good.