LTE not working after factory reset (3G does work) - Samsung Galaxy Light Questions & Answers

Hi everybody.
My problem is not necessarily restricted to this model but I couldn't find a "general" section, this forum is huge.
I'm from Argentina and some time ago I bought an unlocked SGH-T399N to use with my local provider, it worked pretty well. Few days ago I did a factory reset and since then I couln't get my LTE connection working (It worked for a year before the factory reset). Most confusing thing is that 3G connection works fine.
I tried different ROMs, tried every "modem.bin" file I could find for this devide, even contacted my local provider support but they're kinda lost since they don't sell this model here.
So I'm lost here, I guess the seller did something to the device in order to get LTE working in my country, and I deleted it when factory reseted. Though I don't know of anything that he coul've done, just having an idea could put me in the right track (I have no way of contacting the seller).
EDIT: After all my suffering, I tried the very first think that came to my mind but I couldn't try and discarded it for being simple. I tried a different sim card, then put my sim card again. LTE works now. Gosh.

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[Q] Atrix 4g WiFi not working

Hey guys,
i have the atrix 4g on which i used a simunlock code, so that i coudl put in my sim card from a european carrier, that works great, but the thing is the WiFi stopped working, it just went into a scanning/connecting loop and than it disconnects.
So i factory restored it and figuered out that s soon as i put in a working sim card (one that has cellular reception), the WiFi starts to behave like that and to get it to work i have to factory restore again without a sim card or with a nonworking sim card.
So i tried the motorola support and they said ye hardware issue, send in the phone, my problem however is im in europe right now and i cant really send or get the phone to motorola USA and they totally refuse to send it to an address outside of the US. However im 100% sure its a software issue (both things work for itself, and the thing that even removing the sim card doesnt restore the wifi funcionality makes me think there is some software issue).
So please guys if anyone has an idea how i could fix that i would be really greatful. Btw i tried some of the apps from the market to "fix" wifi (fxr, wififix etc). Fxr said it fixed the wifi bit it still wouldnt connect, the other apps just had the same issue as the stock wireless manager.
Thanks for your time
Did.you use software to unlock it or just a code?
Sent from my MB860 using XDA App
just a code
crnkoj said:
Hey guys,
i have the atrix 4g on which i used a simunlock code, so that i coudl put in my sim card from a european carrier, that works great, but the thing is the WiFi stopped working, it just went into a scanning/connecting loop and than it disconnects.
So i factory restored it and figuered out that s soon as i put in a working sim card (one that has cellular reception), the WiFi starts to behave like that and to get it to work i have to factory restore again without a sim card or with a nonworking sim card.
So i tried the motorola support and they said ye hardware issue, send in the phone, my problem however is im in europe right now and i cant really send or get the phone to motorola USA and they totally refuse to send it to an address outside of the US. However im 100% sure its a software issue (both things work for itself, and the thing that even removing the sim card doesnt restore the wifi funcionality makes me think there is some software issue).
So please guys if anyone has an idea how i could fix that i would be really greatful. Btw i tried some of the apps from the market to "fix" wifi (fxr, wififix etc). Fxr said it fixed the wifi bit it still wouldnt connect, the other apps just had the same issue as the stock wireless manager.
Thanks for your time
Click to expand...
Click to collapse
I have the exact same problem.
My phone is unlocked and can make calls, but WiFi disconnects me almost immediately. The phone also thinks my prepaid sim has H+ connectivity.
When I go back to my AT&T SIM, I have to do a reboot or 2 to get it cleared up, and then WiFi works again.
oh, i see that, i guess its some sort of ATT measure to block nonATT SIM cards, eventho the phone gets simunlock code. But the funny thing is there are a lot of people for whom it all works (like the guys in the unlock thread, using it in canada without a hitch), so im really wondering if this is not just a software glitch (i hope it is and gets fixed witht he 2.3 update..), otherwise my only hope are the devs here to crack wide open the bootloader and put some custom roms on it =/ really a great phone, but all this ATT software crap makes it feel like its an Iphone ...
But uhm still, anyone has any ideas how to try to fix this problem before the updates? =/
crnkoj said:
oh, i see that, i guess its some sort of ATT measure to block nonATT SIM cards, eventho the phone gets simunlock code. But the funny thing is there are a lot of people for whom it all works (like the guys in the unlock thread, using it in canada without a hitch), so im really wondering if this is not just a software glitch (i hope it is and gets fixed witht he 2.3 update..), otherwise my only hope are the devs here to crack wide open the bootloader and put some custom roms on it =/ really a great phone, but all this ATT software crap makes it feel like its an Iphone ...
But uhm still, anyone has any ideas how to try to fix this problem before the updates? =/
Click to expand...
Click to collapse
i also have a friend in saudi arabia who got the unlock code and the wifi is working fine.
only 2 people reported this so far. i guess it could be a hardware problem ? because the other user beside you have this problem even without sim installed " or that what i understood from him "
you can check the other thread too. maybe someone could post something usefull.
hmm i see, where did you find that thread, i was sort of searching for ages and didnt find any issues like that =/
Ye i mean i have this problem without a sim aswell if i dont factory restore the phone, after i do that without a sim card however the WiFi works great...
so i am kind of reluctant to believe it being a hardware issue due to this, sort of software specific issue (at least i think if it would be hardware related, the wifi would start working as soon as i go to airplane mode/take out the sim and a factory reset wouldnt be necessary), or do you think that my theory is rather flawed in thinking that?
and ye the problem is im in europe now and as the reps at motorola support told me, i would have to send the phone to the US for warranty and they would only send it back to an address within the US =/ i will try my luck with the german and uk support site, to see if they could do something for me.
thanks for your time guys tho
hey guys what do you think if i would use this code:
* 2767 * 3855 #
Think before you give this code. This code is used for formatting the original manufacturer. This will delete all files and settings, including internal memory storage. This will also reinstall the phone’s firmware.
To restore it to manufacturer (will it request an unlock code again after that?) cuz i have 2 codes to unlock but the first one worked, so maybe if i woudl try it with the second one than?
I just unlock my atrix with the code from cellunlock, works great and wifi is fine as well. Would like to know where u get the code, and how it turns out if u try reset to default using the combo. Pls update. Ths
Sent from my MB860 using XDA App
I'm having the same issue of not being able to connect to WiFi.
I bought the phone in Las Vegas with an AT&T - pay as you go (no contract).
I bought an unlock code from SwiftUnlocks, and used my Rogers SIM, which appeared to work. I then rooted the phone.
Using the Rogers network, I've been unable to use any sort of data. Phone calls and texts work fine. Then I noticed that my WiFi was not working properly. It would try to obtain an IP address, but couldn't connect. After several reboots, I got the phone to connect to WiFi for a few minutes.
I just did a factory reset, now I'm unable to connect to any network or WiFi to login with MotorBlur, so I can't really use the phone now.
I'm quite frustrated and not sure what else I can do.
Update - after putting the original AT&T SIM card in, and rebooting several times, the WIFI started working again.
I'm still unable to get Data working over the Rogers network in Canada.
Squig80 said:
Update - after putting the original AT&T SIM card in, and rebooting several times, the WIFI started working again.
I'm still unable to get Data working over the Rogers network in Canada.
Click to expand...
Click to collapse
i am getting my phone in few hours, then i am going to order from cellunlock a code and wait for 2 days to get the lock. unless someone has a spare code he can pm me i would be thankful.
the code is IMEI specific, cant give oyujust spare codes
secondly, to get wifi to work you have to remove your sim card, put in the att or a nonworking sim card and do factory reset, than wifi will work. and you can load all the stuff via wifi, and than just put in your working sim and use the phone as a phone +3g data (the 3g data works great for me to be honest)
oh i got my code from swiftunlock but i dont think that matters, they all get it from teh same provider im pretty sure.
and if anyone si wondering t he sbf update did NOT fix my wifi problem. i ahve tried several wifi fix programs and neither worked aswell, the fxr wifi did some stuff that the phone now sees the networks but still cant connect.
this is to update everyone that i got the phone. had an issue about the screen doing lots of flickering. contacted amazon and sent it back.
in the whole process so far i lost around 60$ between importing and exporting the phone. all in all. i will stick with my iphone 4 for now. its a good phone.
but i cant take this sadness all over again if i imported another phone with an issue with it as well. i am too OCD for my own good.
so true what you say, tho im coming form a nokia 6220 classic, a bit older than the iphone 4
Hey GUYS...
I have the same problem.... My Bell Atrix WiFi works great with my Rogers SIM (I had someone unlock it for me), but when I put in my Qatar Qtel SIM, it stops working, and goes into that connect/scan/disconnect loop.
Any solutions?
Search in the dev forym there is a solution for it
crnkoj said:
Search in the dev forym there is a solution for it
Click to expand...
Click to collapse
Thanks. Found it: http://forum.xda-developers.com/showthread.php?t=1077329&highlight=wifi
help mine stoipped working
[16:53] <arana> hi guys i need help with an unlocked atrix 4g att , that was ulocked with att code, then in order to use recovery i got one of the files here http://forum.xda-developers.com/showthread.php?t=1204500
[16:53] <arana> now it is unlocked but wifi is stuck at obtaining ip address
[16:53] <arana> i tried the solutoin here: http://forum.xda-developers.com/showthread.php?t=1077329&highlight=wifi
[16:53] <arana> but still not working
[16:54] <arana> i'll appreciate any help
[16:56] <arana> if possible i would like to put the stock recovery partition if that would fix things, or unlock it with official sbf but i can find it
[16:56] <arana> i used zomgunlock-lite.sbf to unlock
any help?
my carrier is telcel (mexico) and wifi was working fine before i "unlocked" the phone, thank you for any help

General sudden network loss on vodafone but not others

hey first post on here and really need a bit of help
i've an unlocked galaxy s2. i updated it and its been running 2.3.4 for a while now with various roms over the top
it was XXKG1 and was running perfect on vodafone
all of a sudden it dropped network. still showing bars, but no g,3g or h beside them. can't make or receive calls. says mobile network not avaliable.
i looked immediately at the apn's. cannot see anything wrong with them. reset to default and tried again. no luck. reset phone to default, no luck.
reflashed the stock 2.3.4 using odin, same again.
thought it was therefore a hardware thing so i tried my mums o2 sim card. works perfect. so its something to do with the vodafone settings. tried a different vodafone sim that i have, still same thing. bars but no mobile network
also tried going in and out of flight mode....and double checked just about every setting on the phone
forgot to add that i then flashed the newer XXKG6 firmware and still no luck
created a new apn using the settings from vodafone site, still nothing
help!!
anyone?? please
Vodafone
Same thing happened to me (Vodafone Romania)
Can't really tell yet if it's a phone issue or an operator issue. On Orange it seems to work OK.
There are plenty of threads, including my own, which regard this matter and still no one has a clear view on the matter.
Meanwhile i've sent mine back to service, to rule out the "faulty hardware" problem at least.
Here are some other threads in which this issue is discussed:
http://forum.xda-developers.com/showthread.php?t=1097612&highlight=data#
http://community.vodafone.com.au/t5...laxy-S-II-Internet-Problems/td-p/19563/page/5
http://forum.xda-developers.com/showthread.php?t=1216438

[Q] Sim network unlock PIN:

I've had my Atrix 4g for about 10 days, never rooted or bootunlocked or anything like that, it's still 100% retail from AT&T. I've just made phone calls and fiddled with a few apps.
Today I had the bright idea to plug my old tmobile sim card into it thinking it'd boot right up and I could go into the settings and copy off some of my old contact numbers, I could always do it on older less than smartphones. Well it came up asking for a Sim network Unlock PIN. I didn't know what that was so I just took it out and put my old AT&T sim back into the phone, thinking it was just a failed endevour and that I would just go on about my business like it had never happened.
Well upon booting with the activated sim card the phone came with and the one I've been using... Much to my dismay, it's STILL asking for a Sim network Unlock PIN, I haven't the slightest idea what that is and I can't get past it unless I boot the phone up with no BP, then I can get into android and fiddle around on my wifi and do that kinda stuff but the Network Provider bars won't light up, it's like it has no idea who my cell provider is even though the at&t sim card is in it!
I'm at a loss, I called AT&T and I went into their store, but the most they could do for me was give me an 8 digit pin that didn't work and I found something on motorola's site that said something like 4digits of 1's and that doesn't unlock it either. They even gave me a new sim card at the store, and it's still asking for the Sim Network Unlock PIN. It's as if MOTOBlur has went ass up I did a factory reset after the new sim card, and yet it's still asking. I haven't the slightest idea what to do. AT&T said they'd just replace the phone and of course I'd probably be out of a phone for a couple weeks.
I'd be glad to try some troubleshooting if someone is willing to work with me.
Matt
bring your phone to a local at&t store and ask for a replacement.
Luckily they dont' have any in stock as they only have the atrix 2 in stock nowadays, so once again without for a couple weeks
Ya, I didn't think anyone would be able to help me here, other posts relating to this topic have gone unsolved as well worth a shot I guess.
It was posted elsewhere flashing a different carriers radio and then unlocking worked. Then the user was able to flash the newest radio for his carrier.
Sent from my MB860 using Tapatalk
I would love to flash, but I don't suppose I'd get another try if I accidentally flashed the wrong file...
I just wish I could flash it back to the way it was when it first came out of the AT&T box the other day...
I found someone who had a tmobile account and had them call for me using my imei number and they've requested an unlock code from motorola, so I'm going to wait for that and see what happens...
I still feel like there should be some kind of way to flash back to an original firmware someone might be able to copy off from an out of the box at&t atrix.
Are you sure you're not looking at the Motoblur account login?
positive, says Input Sim Network PIN and it stays resident regardless what sim is inserted.
It is kind of funny how the factory reset doesn't actually reset it back to factory conditions
eylusion said:
It is kind of funny how the factory reset doesn't actually reset it back to factory conditions
Click to expand...
Click to collapse
All factory reset does is wipe the data partition, which would put it back in a "factory like" state.

In need of some assistance:I9300GSMH

Hello, First post here on Xda, Nice to meet you all.
I'm looking for some serious help with my new samsung galaxy S3GSMH International version.
Long story short, My girlfriend lives in germany, While on holiday there I purchased a samsung galaxy s3i9300 and was told it will work in any region any network due to being factory unlocked.
In germany I was using a sim card from VIVA mobile or something of the like and it worked fine.
After I returned home, I switched in my UK Vodafone sim card, A message then popped up saying, Please select sim service:vodafone UK/Vodafone UK prepaid.
So I chose Vodafone UK and clicked on OK, I thought everything was fine untill i tried to make a call and got, Not registered on network.
Now I have searched for days in all types of threads to get this fixed, I have tried flashing stock firmware with odin/emergency recovery Via Kies/Flashing modems/flashing patched modems/patched kernals/Ariza patch/Ariza patch Jb.
My Imei is fine and matches under the battery, The S/N also matches under the battery.
So I just don't understand it, If it asked me to choose which sim service surely that means it has some type of connection with the network? I have full signal bars too.
Is there anything else i need to do to get this working? Because I am at a loss, And I obviously can't take it back due to the shop being in germany
Any help or input is extremely appreciated!

H830 Sim card will not register on tmobile network, or any other: solved

Yesterday I noticed that I had an er081 (no wifi calling). I thought it was a wifi issue at first, but I tried calling and had no network connection. It shows bars, but will never register the sim on the network. I thought my sim might be bad, but I popped it into an old phone and it worked fine. I tried to reset network to defaults, checked APN (which was greyed out so I could not edit, but looked correct). Then I gave in and did a factory reset in twrp which is super annoying since my phone was working perfectly. None of these things helped.
Any suggestions? I was going to try and upgrade to a newer stock, but I was actually already on the newest stock rom anyway (from august).
Tried
*#*#4636#*#*
I have an IMEI etc...I would post pictures, but that seems sort of like a bad idea. It seems from googling that this is a problem that used to be more common, but suggestions do not seem to work. I don't see how this can happen when SIM works fine on another phone.
I have installed the sim on a nexus 5x and a 6p, both worked. That makes me think hardware error, unfortunately, but I honestly do not see how that can happen if I can see all the networks and their signal strength etc...
Weirdly enough I borrowed someone else's sim card and tried it. Upon boot it said they had a new voicemail which made me think it was connected, but when I tried to call it said emergency calls only. It was like it connected for a second then got kicked off the network.
Ok so I found out the cause and I am an idiot sort of. My phone was marked as stolen. I could not log in b/c I could not verify with my phone number previously so I gave up on it and forgot to recheck when I got an old phone. Still sort of perplexing as I have zero idea how this happened. Could it occur somehow in a pocket? It seems highly unlikely. Anyway I am happy to be done with this, but sad to reset everything back up. Bleh...

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