Develop Bugs

No 3g service, faulty verizon SIM card

Curious if anyone else had experienced this.
Over the weekend I could not connect to Verizon's 3g network. When I was in a 3g only area, I would have grayed out bars and no 3g icon. I was able to connect to the 1x network and make phone calls. When I was in a 4g area, I could connect to the LTE network and use data fine. I first re-flashed the 4.0.2 factory radios (I had the 4.0.3 leaked radios) to no avail. Then re-flashed the entire factory image and that didn't change anything either.
I brought the phone to my local Verizon store and they swapped out the SIM card. I was under the impression that the SIM card was only used to connect to the LTE network, so i didn't think it would have any effect. To my surprise, the phone was able to connect to the 3g network again.

bairdi said:
Curious if anyone else had experienced this.
Over the weekend I could not connect to Verizon's 3g network. When I was in a 3g only area, I would have grayed out bars and no 3g icon. I was able to connect to the 1x network and make phone calls. When I was in a 4g area, I could connect to the LTE network and use data fine. I first re-flashed the 4.0.2 factory radios (I had the 4.0.3 leaked radios) to no avail. Then re-flashed the entire factory image and that didn't change anything either.
I brought the phone to my local Verizon store and they swapped out the SIM card. I was under the impression that the SIM card was only used to connect to the LTE network, so i didn't think it would have any effect. To my surprise, the phone was able to connect to the 3g network again.
Click to expand...
Click to collapse
According to a friend of mine, the SIM card actually holds the CDMA data in it now, so having a bad SIM card will actually mess up your CDMA.
Guess VZW is GSM now.

Yes, over the weekend my sim died as well. Same exact problem. It happened to a friend as well. For us, it happened Friday.

Longcat14 said:
According to a friend of mine, the SIM card actually holds the CDMA data in it now, so having a bad SIM card will actually mess up your CDMA.
Guess VZW is GSM now.
Click to expand...
Click to collapse
<yoda> A sim, GSM does not make. </yoda>

Longcat14 said:
According to a friend of mine, the SIM card actually holds the CDMA data in it now, so having a bad SIM card will actually mess up your CDMA.
Click to expand...
Click to collapse
Verizon validates LTE subscribers via the SIM, like a GSM carrier. There is no ESN, as found in CDMA carriers. This is part of their eHRPD bridge from CDMA to LTE. It is also why people couldn't get 3G when the LTE network crapped out last month.
On the plus side, you can swap phones by inserting the SIM now. Welcome to 1995.

The kid at the Verizon tried to tell me that It probably happened from toggling the preferred network mode from LTE/CDMA to CDMA. I hope that the design isn't so poor that this would be the case.

ATnTdude said:
Verizon validates LTE subscribers via the SIM, like a GSM carrier. There is no ESN, as found in CDMA carriers. This is part of their eHRPD bridge from CDMA to LTE. It is also why people couldn't get 3G when the LTE network crapped out last month.
On the plus side, you can swap phones by inserting the SIM now. Welcome to 1995.
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Click to collapse
Ohh, so thats why when your SIM craps out, you lose CDMA too.
And @ adrynalyne, that's funny, but you know I was just joking? xD
Sent from my SAMSUNG-SGH-I727 using xda premium

bairdi said:
The kid at the Verizon tried to tell me that It probably happened from toggling the preferred network mode from LTE/CDMA to CDMA. I hope that the design isn't so poor that this would be the case.
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Click to collapse
I really doubt that.

ATnTdude said:
On the plus side, you can swap phones by inserting the SIM now. Welcome to 1995.
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Click to collapse
Sooo if somebody steals my phone now they can just use it? I can't call and report the ESN stolen and blacklist it?

Longcat14 said:
Ohh, so thats why when your SIM craps out, you lose CDMA too.
And @ adrynalyne, that's funny, but you know I was just joking? xD
Sent from my SAMSUNG-SGH-I727 using xda premium
Click to expand...
Click to collapse
My comment was pretty much tongue in cheek
I can't do a <yoda> and keep a straight face

Can a 3G Sim work on this phone?

So, I'm debating right now between the Hox and the gs3 and honestly the only reason why I can't get this phone is because its lte. I use a 3G sim for all my phones (except my nitro, I don't have a sim in that at all) so I need to know if one can insert a 3G sim and still get data. Oh, and I heard this uses a microsim slot? Tim to get my sim cut....
Sent from my LG-P930 using xda premium

Both hox and GSIII have micro sim slots. It does have 3g, I use it all the time as there is no 4G in Pennsylvania. Not sure if you'd have to sim unlock it though.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2

corythug said:
Both hox and GSIII have micro sim slots. It does have 3g, I use it all the time as there is no 4G in Pennsylvania. Not sure if you'd have to sim unlock it though.
Sent from my SAMSUNG-SGH-I747 using Tapatalk 2
Click to expand...
Click to collapse
Oh. Thanks. Just asking cuz my nitro only works with specifically designed 4G at&t sims. All other carriers, whatever sims they give, work fine.
Sent from my LG-P930 using xda premium

why are you resistant to update your SIM card? also your 4G LTE connectivity will depend on your data plan.

I had a iPhone 4 3G Microsim and i had to go to AT&T to get a new sim card because my S3 would not pick up data. After a new sim card and adjustments to my account it was finally able to pick data.

J Prime said:
I had a iPhone 4 3G Microsim and i had to go to AT&T to get a new sim card because my S3 would not pick up data. After a new sim card and adjustments to my account it was finally able to pick data.
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Click to collapse
Same thing for me, except i didnt need a new sim. All they had to do was change the imei on my account so my phone with that imei can receive data. The rep told me that its because you can only have one phone with data at a time, as opposed to just being able to switch sims just to receice cellular service for calls.

Post questions in QnA please

meaintsmart said:
Same thing for me, except i didnt need a new sim. All they had to do was change the imei on my account so my phone with that imei can receive data. The rep told me that its because you can only have one phone with data at a time, as opposed to just being able to switch sims just to receice cellular service for calls.
Click to expand...
Click to collapse
I went through similar a long time ago when I got my Atrix. I upgraded from a iPhone 3G and just continued using same SIM. At&t just updated my data to "4G" and updated my imei and everything was groovy from then on. I'm on a whole new account for my S3 though
Sent from my SAMSUNG-SGH-I747 using xda premium

3g will work if you use the regular apn. If you use the LTE apn (PTA), that will only work with an LTE sin card.

[Q] Force Roaming GSM Networks

My phone service, (i wireless), has mostly EDGE in the service area which really pisses me off.
I live in Garner and sadly I can't user Verizon's LTE which is available in the area because it is CDMA.
Anyway, I'm usually in a town which has AT&T in it (not Garner) and they offer 3G/4G.
I don't care if you think AT&T isn't the best, or is slow.
i wireless is having major network improvements this year and until I get 4G; I want AT&T.
How can I acquire their service, I want to force roam to them.
Can someone tell me how to do this?
I am running Android 4.1.2 (CM10).
Thanks!

http://forum.xda-developers.com/sitesearch.php?q=force roam at&t

WOAH ZOMG SO HELPFUL.
Honestly, that was really helpful.
I've already searched; that's why I'm asking here.
I've tried other methods.
Most force roaming is with CDMA networks.
Thanks for being so helpful.
Someone who actually knows help me please!

Can anyone help me?

electro` said:
Can anyone help me?
Click to expand...
Click to collapse
The galaxy nexus is a carrier unlocked unbranded phone... Just slap an at&t SIM card in it...
Unless I'm completely missing something here.
Sent from my Galaxy Nexus using xda premium

You aren't, but I just want to roam; not have another plan. Would sim unlocking do me any good?
Sent from my Galaxy Nexus using xda app-developers app

electro` said:
You aren't, but I just want to roam; not have another plan. Would sim unlocking do me any good?
Sent from my Galaxy Nexus using xda app-developers app
Click to expand...
Click to collapse
It's already sim unlocked... Just go into the mobile data section of your settings and select your carrier
Sent from my Galaxy Nexus

"Your SIM Card does not allow a connection to this network."
Maybe I should mention that my phone is an import?
Yes it is unlocked, I knew that already.

electro` said:
"Your SIM Card does not allow a connection to this network."
Maybe I should mention that my phone is an import?
Yes it is unlocked, I knew that already.
Click to expand...
Click to collapse
your APN settings are tied to the simcard.
the phone has nothing to do with roaming, your sim determines where you can and cant access towers (except for emergency calls, those are always allowed)

Zepius said:
your APN settings are tied to the simcard.
the phone has nothing to do with roaming, your sim determines where you can and cant access towers (except for emergency calls, those are always allowed)
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Click to collapse
Yeah I know that.
But even if there's nothing but AT&T for a service and I try and select it, it won't work.
Changing my APN settings could work, but idk.

electro` said:
Yeah I know that.
But even if there's nothing but AT&T for a service and I try and select it, it won't work.
Changing my APN settings could work, but idk.
Click to expand...
Click to collapse
you need a sim that connects to the ATT network. you are using a provider that uses tmobile.
you're trying to do something with the phone that has NOTHING to do with the phone.
EDIT: also if you want 4g LTE through att, you will never have it as the phone does not support LTE in the GSM variant.

Zepius said:
you need a sim that connects to the ATT network. you are using a provider that uses tmobile.
you're trying to do something with the phone that has NOTHING to do with the phone.
EDIT: also if you want 4g LTE through att, you will never have it as the phone does not support LTE in the GSM variant.
Click to expand...
Click to collapse
I'm not an idiot, I thought that that was common sense.
I want 4G HSPA+.
T-Mobile is a priority.
You can use AT&T still.
When I tried roaming to it though it wouldn't accept it.

electro` said:
I'm not an idiot, I thought that that was common sense.
I want 4G HSPA+.
T-Mobile is a priority.
You can use AT&T still.
When I tried roaming to it though it wouldn't accept it.
Click to expand...
Click to collapse
i never called you an idiot so dont get all defensive.
prepaid plans generally do not let you roam. if they do, its usually voice only.

Zepius said:
i never called you an idiot so dont get all defensive.
prepaid plans generally do not let you roam. if they do, its usually voice only.
Click to expand...
Click to collapse
I didn't mean to come off defensive, I'm just tired.
My plan isn't prepaid either, it's post paid.
AT&T comes up as a network option and I have used it before on previous phones.

Did you ever get this figured out? I have the exact same problem as you. I also have iwireless and have the slow 2g when 4g signal is low. I am looking to force roam on AT&T when I don't have iwireless 4g. Hoping to hear back. Thanks

No lte on my galaxy s4

I have a completely stock galaxy s4. I never get LTE though. My girlfriends s4 gets it just fine and in the same exact location I still only have hsps+. What's the deal? I have the settings configured correctly and everything. There's zones where my phone just drops all data, before it reconnects. My first s4 had this problem, so I got it replaced at T-Mobile, and it still has the same problem. Customer service says everything on their end is working fine. I even had them boot my phone off the network and Put my phone back on and still. What's going on? Faulty LTE radio?

Could be a faulty micro sim card as well.
Galaxy S4 running DarthStalker Rom v.3

acesofbelkan said:
I have a completely stock galaxy s4. I never get LTE though. My girlfriends s4 gets it just fine and in the same exact location I still only have hsps+. What's the deal? I have the settings configured correctly and everything. There's zones where my phone just drops all data, before it reconnects. My first s4 had this problem, so I got it replaced at T-Mobile, and it still has the same problem. Customer service says everything on their end is working fine. I even had them boot my phone off the network and Put my phone back on and still. What's going on? Faulty LTE radio?
Click to expand...
Click to collapse
Do you get lte using wifi?

Utorrent76 said:
Could be a faulty micro sim card as well.
Galaxy S4 running DarthStalker Rom v.3
Click to expand...
Click to collapse
I had the sim card swapped out for a new one as well at T-Mobile and it didn't fix anything. I'll try using my gfs sim later tonight.

richardlibeau said:
Do you get lte using wifi?
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Click to collapse
Nope, says hspa: 11. I turned the call over WiFi feature and still the same.

Are you on the correct apn? The fast.tmobile.com apn?
Sent from Flip's Galaxy S4

elflip88 said:
Are you on the correct apn? The fast.tmobile.com apn?
Sent from Flip's Galaxy S4
Click to expand...
Click to collapse
That's right. Although, when I try to edit the APN everything is greyed out. It doesn't let me edit anything. Probably a safety feature so people don't ruin the stock APN. But yes, its the correct apn

elflip88 said:
Are you on the correct apn? The fast.tmobile.com apn?
Sent from Flip's Galaxy S4
Click to expand...
Click to collapse
Not to hijack the OP's thread...but should users be modifying the APN or is that pushed from tmo automatically? I'm sitting on epc.tmobile.com, and getting LTE (LTE:14, guessing 13/14 is the band?) Is it worth manually modifying the APN?

Toleraen said:
Not to hijack the OP's thread...but should users be modifying the APN or is that pushed from tmo automatically? I'm sitting on epc.tmobile.com, and getting LTE (LTE:14, guessing 13/14 is the band?) Is it worth manually modifying the APN?
Click to expand...
Click to collapse
I tried both. For some reason, I get faster speeds with epc then fast.
Sent from my SGH-M919 using xda app-developers app

Toleraen said:
Not to hijack the OP's thread...but should users be modifying the APN or is that pushed from tmo automatically? I'm sitting on epc.tmobile.com, and getting LTE (LTE:14, guessing 13/14 is the band?) Is it worth manually modifying the APN?
Click to expand...
Click to collapse
The band is 4/2100mHz I believe. Or 1700mHz. Fotlr the same reason that hspap:15 and hspa:11 I have n9 idea why lte:14
Sent from my SGH-M919 using xda premium

So I tried my gfs sim and LTE worked. So its not the phone. Called tmobile tech and they said everything was good on their end. I got my sim card replaced again. A ttmoile worker said it could just be my line. That shell have to close my line and start a new one. For feee of course

OnePlus 3 AT&T No LTE

I have had my OP3 for over a week now and this whole time I can not get LTE service. It is just stuck on HSPA. I called AT&T and went to an authorized retailer and a device support center and my problem was not resolved. I contacted OnePlus as well but again got no solution.
HSPA is not too slow, as the download speeds are about 6 Mbps, which is tolerable. But LTE speeds are just so much quicker. One thing I thought I would try is dialing *#*#4636#*#* and checking in the settings in that menu. Under "Preferred Network Type," it says "GSM auto (PRL)," and every time I try changing it to an LTE option it just automatically goes back to the GSM auto option.
Does anybody have any solutions? Any help would be appreciated. Also, my APN settings are 100% correct, they have been checked/changed numerous times.

http://forum.xda-developers.com/showthread.php?t=3402787
Sent from my ONEPLUS A3000 using Tapatalk

Yeah change your IMEI back to the one you used for your previous phone. Then swap your sim to the other slot.

biglilsteve said:
Yeah change your IMEI back to the one you used for your previous phone. Then swap your sim to the other slot.
Click to expand...
Click to collapse
My IMEI has been changed to my other phone and I have swapped SIM card trays and it's still at H.

PreferAndroid said:
My IMEI has been changed to my other phone and I have swapped SIM card trays and it's still at H.
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Click to collapse
AT&T changed it for you? All I had to do was reboot after they changed it on their end and i was good to go. Don't know why you would swap sim trays though. Doesn't matter which one it is, both pick up LTE.
Sent from my ONEPLUS A3000 using Tapatalk

noobtoob said:
AT&T changed it for you? All I had to do was reboot after they changed it on their end and i was good to go. Don't know why you would swap sim trays though. Doesn't matter which one it is, both pick up LTE.
Sent from my ONEPLUS A3000 using Tapatalk
Click to expand...
Click to collapse
Once I provided the OP3 IMEI-1 to ATT, the phone would only get H using the sim in the 1st tray. Even after I got them to switch it back to my N6 IMEI. Once I put the sim in tray 2, LTE started working again.

I have straight talk which is a MVNO using ATT and I had just H service and it changed to lte service after an hour or so.

I kinda hate my one plus 3 when its off wifi, its always slow speeds and im on AT&T... Here in Oklahoma City.... My google nexus 6p never had this issue it didn't seem... ugh can anyone help?