I've searched and didn't find any thread with this kind of issue specifically. I have a Verizon Galaxy S4 that doesn't seem to like GSM SIM cards; it looks like it is not GSM unlocked. I have tried every trick to get it to switch to GSM but it doesn't. I have flashed the same version firmware it came with (ME7) just to be certain it's factory restored, and also updated to MK2, yet no GSM. It sees the SIM card but doesn't show a signal, even when I manually switch to GSM/UMTS. I have programmed a CDMA number on it manually then tried the GSM switch again, yet no GSM signal. It sees CDMA signal fine though and can even make calls on CDMA. I even had to check the MEID/IMEI and it came back clean so I'm just surprised at all this. I have done this before successfully on a Verizon S3 and it worked well, how come the S4 has refused to work on GSM?
Please help, anyone?
Did you input APN's?
I thought APN settings had to do with data. I will do that now. I'm willing to try anything now.
Thanks.
I am having the same issue with a couple s4s from verizon as well. Checked the IMEI/MEID and they come up clean but they will not catch a signal with a gsm SIM card. I have tried several active AT&T and T-mobile SIM cards in the phones with the same results, no service/signal. Very strange as I have never had an issue with verizon S4s working on AT&T or T-mobile. The weird thing is that with a verizon SIM they catch signal and 4G just fine. Toggled GSM/CDMA and put in APNs and still no luck. I'll keep trying to work this out but right now I am stuck.
I had the same problem here
My GT-I9505 Rom Stock 4.4.2 ZTO(Brazil) had the same problem about signal problem.
Everytime i lock my phone (turning off the screen), by the time i light it on (lock screen), immediatelly my phone turns the signal to "No service".
In this time, i need to wait 1-2 minutes to the phone turns okay. Just wait.
I search for a lot of solutions and didn't find anything.
Notice too that the problem appears only network 2-3g. 4G didn't have the problem.
I solved this problem after Lollipop update. The problem simple dissapear!
(Sorry my bad english)
Related
my friend tom got his galaxy s like two months ago. he has a even more plus plan with unlimited everything on tmobile and he used that in a iphone 3g for a year with no problems and he could roam with no issues on att.
with his new vibrant its not working! it takes forever to try to connect then gives a error. the sim should be good since it roams in two other unlocked phones..
for the note, his phone IS unlocked... that was the first thing we thought of..
the error is: unable to select network.. your sim card is not allowed to connect to this network
this phone is a quadband phone so it should work.. we have put a att legit iphone sim in it and it works great.. what gives? why can't he roam on this new phone when other phones do? running bionix rom.. have tried updates, wondering if anyone has any opinions or info
we've already tried changing network settings with *#0011#, gone into service mode *#*#197328640#*#* with no luck
edit: we've tried not allowing the phone to connect to our local att 3G band (1900) and use all other bands again with no luck. the phone connects to canada's rogers network tho.. weird..
anyone check this out yet?? anyone got it workin? any reports would be killer ...
we have tried more settings through service mode still with no luck. when we specify certain bands and leaving the att 3G local band unchecked, it will not hop on T-mobile with the setting! Crazy! not sure if it's the rom, radio version or kernel but we will keep tweaking and posting results.. if anyone is having this issue or has concerns any posts or signs of life would be cool lol
Same issue
Unfortunately, I don't have a solution, but I've been working on this same issue since september. I originally contacted tmo about the problem to see if they somehow hadn't provisioned my phone/account for roaming. Needless to say they were not much help. They suggested I exchange the phone for a new one, which I did, and I still have the same problem.
I'm in a rural area of california where tmo has roaming on att towers. My girl has tmo service with a different samsung phone and she can roam on att just fine. She can send/receive calls and text. I even put my sim in her phone, and it works, so I've pretty much narrowed the problem down to an issue with the vibrant itself.
My phone is not unlocked, so we've ruled that out. I'm running bionix fusion with ji2 modem now, but I've had the issue with the stock phone before ji6, and after ji6 ota. I've tried messing around with the service menu the same as you, and I haven't got anywhere either.
I have been able to get the phone to at least lock on to att by adding the apn internet2.voicestream.com, and it will get past the "not registered on network" message. Unfortunately, it won't complete a call or send a message, it just times out after about 15 seconds and drops back to the previous menu (depending on whether I tried to dial out of contacts, the call log, or the dialer). But it does not give me an error message, it behaves as if the call connected and immediately hung up.
I had given up on it for the past couple weeks, but I have time now to try and work it again. Let me know if you've gotten anywhere, and I'll do the same.
The fix is: when you're in an att roam area, set your phone to gsm 850 only via the service menu. If your phone doesn't auto lock on the att network, search for available networks and choose att. After that you should be able to send and receive calls and texts.
after yet some more messing around, still no luck. it's clearly a thing with tmobile not allowing roaming..... because i read many threads off the gooooogle that say tmobile is pretty much going away and any "contractless" plans don't have roaming so they don't lose money....
dickheads. at least he's grandfathered in with a good unlimited everything plan tho..
even if all this said, if anyone finds any info out post!
the other day i was out of tmobiles network coverage and on att voice and edge not 3g. i live in texas
this is with a stock vibrant jI6
tried the app RoamControl with no luck. it uses different tmobile bands when in "roam only" mode. anyone have any luck yet?
For some weird reason, ever since i got my GS3, i lost LTE. Its odd because i come straight from the skyrocket so i already had the lte data. But since i got the GS3, my phone can only connect to 4G (NO, 4G is not LTE, its H+). So i called rogers tech support, i spent about 4 hours with them, making tests, getting transfered to level 2, then to customer service to make sure i had an lte data plan...finally they told me your phone is broken to get a new one. So i go to rogers, they give me a brand new GS3, same damn thing...only getting 4G. We tried 3 different sim cards, nothing.
Then i call back rogers, they transfer me to the "above level 2" which they told me is the master departement. They guy tells me they will emulate my sim card in their lab with a GS3 they have...but nothing. All settings seemed right, APN and everything was good, so they finally opened a master ticket.
But for some reason, i dont beleive i'll get a call back anytime soon, so anybody might have any suggestions?? I'l fully stock, not yet rooted
Try performing a manual network search, then select Rogers to have it manually "Register" on the network.
For some odd reason, I had the same problem as yours, but after manually registering, LTE was back on, I switched it back to Auto after
check the sim card, there is also a chance that they gave you a 4g sim card and not an LTE one (bell did this to me)
If its LTE then go to the dialer and press *#2263# choose LTE and then LTE all (when you are in an LTE area) when it connects to LTE data do the same thing again but select automatic.
evilgabbie said:
Try performing a manual network search, then select Rogers to have it manually "Register" on the network.
For some odd reason, I had the same problem as yours, but after manually registering, LTE was back on, I switched it back to Auto after
Click to expand...
Click to collapse
tried it...no success
y2whisper said:
check the sim card, there is also a chance that they gave you a 4g sim card and not an LTE one (bell did this to me)
If its LTE then go to the dialer and press *#2263# choose LTE and then LTE all (when you are in an LTE area) when it connects to LTE data do the same thing again but select automatic.
Click to expand...
Click to collapse
euff yeah, i think i would have checked for the lte sim card in the first place. As i said, we tried 3 different ones.
ill try that thx
Well selecting lte bands manually didnt work.
so then the sim does say LTE on it and not something like 4g? outside of manually selecting and waiting. I'm not sure what else. Maybe try getting them to give you a different sim and test in person. wish i could be of more help.
So i go to rogers, they give me a brand new GS3, same damn thing...only getting 4G. We tried 3 different sim cards, nothing.
Click to expand...
Click to collapse
I already said that when they gave me the phone we tested 3 different sims. Same result. The only way i could isolate the problem is to have a person with a working GS3 on rogers give me their sim
I have never seen LTE when passing through an LTE area. Often I get knocked down to Edge while in Vancouver. No LTE where I live, bus something seems wrong. I was thinking of shutting off the 3g in network settings to see if that helps.
I am new to Rogers and not use to getting bumped down to Edge, as Telus only has a 4G network. Does this happen regularly, or is it a phone issue?
Yesterday I bought an i717, an unlock code so I can get it working on T-Mobile, and put the newest Cyanogenmod nightly on it.
I noticed that my data speed was stuck on Edge and found out with some searching that this was common problem. I went to this thread and have followed it's instructions but now I've hit a wall and can't figure it out.
I've flashed both the radios that should work but am getting no working results. Can anyone offer me a hand with this? I would greatly appreciate it.
I don't have T-Mobile but suggest try different ROM. Also make sure have most recent twrp
affiatic said:
I don't have T-Mobile but suggest try different ROM. Also make sure have most recent twrp
Click to expand...
Click to collapse
I'll give that a shot, thanks
Thanks for the reply. I tried all that, new TWRP and all kinds of different ROMs but the problem persists. I did notice one thing however, and that was when the phone had the ROM flashed on it, brand new (like just after a factory reset), 4G worked really well. That is up until I turned the wifi on. Turning the wifi back off, and/or restarting, and/or clearing cache and dalvik will not get the 4G connection back. I'm at a loss. Also if I try flashing a different radio I'll have the disappearing APN problem. So for now I'm stuck with EDGE.
What other options could fix this? Could the build prop be making a fuss? I don't really know where to go.
It sounds like your sim isn't a 4g provisioned sim. The APN would stick if the sim was appropriate.
rangercaptain said:
It sounds like your sim isn't a 4g provisioned sim. The APN would stick if the sim was appropriate.
Click to expand...
Click to collapse
I think my SIM is provisioned, it works fine in any other phone from tmobile. in my gs2 I had it worked fine. that was a few days ago.
sensationfan623 said:
I think my SIM is provisioned, it works fine in any other phone from tmobile. in my gs2 I had it worked fine. that was a few days ago.
Click to expand...
Click to collapse
Tho I guess a new SIM card could be worth a shot.
This is "The Answer Post"
I got it! It was in the mobile network options. Since this is an ATT phone with an ATT radio I had to think a little differently, since I'm used to T-Mobile settings. The "Data Roaming" and "National Data Roaming" check boxes were unchecked. Again, being an ATT radio I guessed that these needed to be on. Once doing that I went down to network operators to manually select "T-Mobile" as my network. Once I did, voila! 4G connectivity now works like a charm.
Just wanted to let the internet know, in case someone else needs this.
Good save!
Hey guys, tried searching everywhere for this answer. After every phone call my radio resets each time. Started happening on CM11,then on ART MOD rom, and so on. Even tried flashing Stock LG ATT 4.1. I tried flashing different modems, stock att, hybrid , lte hybrid and so on. Any other ideas?
Thanks!
AT&T doesn't support voice over LTE. Every time you make a call, it switches to H+. Its supposed to switch back to LTE after hanging up. I had issues with it under artmod and the other kitkat stock bases.
Sent from my AT&T LG Optimus G
plaster said:
AT&T doesn't support voice over LTE. Every time you make a call, it switches to H+. Its supposed to switch back to LTE after hanging up. I had issues with it under artmod and the other kitkat stock bases.
Sent from my AT&T LG Optimus G
Click to expand...
Click to collapse
Thanks for the reply!
Did your modem reset to were it would show no service and no data, then turn back on to H+ then LTE?
Mine will do this ever so often.
No, it was instant.
Sent from my AT&T LG Optimus G
My question to all the developer here... can anyone help me please? i have LG Optimus G E970 at&t and having serious issue as it is not detecting sim network, everything is running fine except sim network. I was on stock and all things running fine but i installed 4.4 kitkat rom from this link: https://yadi.sk/d/F7yqEV7yaFk8V
then my network not worked, i restore back to stock 4.1.2 but still same problem, no sim detected, i showed it to market developer and they said it is hardware issue while i told them its happened due to installing rom and one have tried on it all things as he was software engineer but no luck, then i gave it to repair shop and they changed its sim jack and insert everything perfectly, but still no network! though one changed in that now when i put sim its not showing but when i eject sim from the jack while phone on the message comes "Phone will restart to use GSM network" and then phone is restarting but same problem , no sim.....!
can anyone tell me exact solution for this? is it really hardware issue or software related? i m stuck up and spent heavy amount on it and still on risk.... i will appreciate your kind cooperation.... thanks in advance..
I have a temperary solution.. hopr it help
I have the same problem and tried everything I could...
If you are in a city area just flash .48 or .54 nexus 4 radio. You get your sim working and can call...
But this will have bad signal strength in Idea 2g network. All the best.
i'm also having the same problem. after every single phone call, the modem resets and the only option is to reboot it. downloaded the latest nightly and did a factory reset and flashed it but it still was re-setting. going to go back to stock.
Hello people. I am hoping for some help. Have s4 mini I9195. Unlocked. Currently I am connected to T-Mobile network. However can only get 2g in my area. So bought, activated, registered, and paid for att account. Now have both T-Mobile and att. However, when plugging in the att aim it WILL NOT connect to att. I get 4 Signal bars on phone but no connection. Have correct apn. Spent two hours with att it's not on their end. Sim card works fine in different phones and other att sims WILL NOT work in my phone. So we know it's NOT a Sim issue. And remember T-Mobile network is connected and working. Only att is the problem and will not connect. Any ideas?? Please help??
I'm on the verge of flashing custom recovery, rom, gapps, to maybe fix this but want to make sure I am not missing something more simple first.
I've done all the basic stuff from resetting phone, apns, closest tower, etc.. Just see seems like phone will not accept att now. It did for first night for about 15 mins got texts and Signal, but nothing since. I am stumped.
Thank you for any help