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unable to unlock galaxy s4 i337

I searched and see some people are having the same problem as I do.
My problem, I can not get my ATT galaxy S4 SGH-I337 to unlock. I tried the free method. I bought code, two places, got the same code. But no luck on unlocking this bad boy. Anyone figured out how to unlock it yet? What can I do?

you mean SIM unlock, yes? cell un locker.net worked for me, as did free method. i was going overseas, tried free method which worked with t-mob in USA, but wanted the code just to be safe.

You could use the search function and read the threads that are just like yours: "how do I unlock when free version fails" type thing.
Yes it takes a few minutes to review the first few pages of the general and QA forums, or to use the search function, but I promise you that others have already posted solutions that worked for them.

Please read forum rules before posting
Questions and Help issues go in Q&A and Help section
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Here you go
navy2012 said:
I searched and see some people are having the same problem as I do.
My problem, I can not get my ATT galaxy S4 SGH-I337 to unlock. I tried the free method. I bought code, two places, got the same code. But no luck on unlocking this bad boy. Anyone figured out how to unlock it yet? What can I do?
Click to expand...
Click to collapse
http://forum.xda-developers.com/showthread.php?t=2282683

unable to unlock galaxy s4 i337 ATT
Thanks for all the replies. As I have said, I tried the free ways of unlocking and the buying the code way to unlocking. But still no luck. I can not get it to sim unlock. Anyone having this problem?

Did you try fastgsm.com 15 dollar cable (usb power cord) unlock..worked like a charm for me when I was in the same boat your in
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2

I'm the same boat here bought the code (2 places same code), code will not unlock, now I'm on CM10, but I can not find anywhere that ROM version makes a difference to unlocking did not with teh Atrix and S3 I unlocked. Still kind of stuck, Maybe is it is the F3 modem or something else, really just do not know or understand why I'm encountering issues since other than this thread everyone seems to be having no issues.
Thanks,
ERIC

navy2012 said:
Thanks for all the replies. As I have said, I tried the free ways of unlocking and the buying the code way to unlocking. But still no luck. I can not get it to sim unlock. Anyone having this problem?
Click to expand...
Click to collapse
It works, you missed a step somewhere, try once again. It is the US version you have correct?

Need held unlocking sgh-i337m Telus version
I am new at this. First post ever.
Followed the instructions here to free unlock my phone
Went through the steps twice and did not unlock my device.
So I thought I did something wrong so I went to try one last time. However this time the phone won't allow me past the 1st step.
I enter: *#0011#
Then menu back
Then menu input 1
And at this point the phones restarts. It won't allow me to the full service menu.
Can someone help me please.
The phone is brand new and at one point the was a Samsung update the was downloaded and installed. Don't know if this download changed the system and access to service menu

For some people it fails doing the free method even though they followed it correctly and jt messes up something internally that prevents even the official code from working. The only work around to unlocking it at this stage is via a service called FastGSM from what I've read.
Sent from my SGH-I337 using Tapatalk 2

USB cable method does not work for newer baseband versions
cammeron1978 said:
Did you try fastgsm.com 15 dollar cable (usb power cord) unlock..worked like a charm for me when I was in the same boat your in
Sent from my SAMSUNG-SGH-I337 using Tapatalk 2
Click to expand...
Click to collapse
fastgsm cable does not work if your baseband version ends in anything later than ME1. Mine is MF3 and I did not understand this until after I bought the software for USB cable unlock from fastgsm. I have not found any method that will work for me so far.

This is old, but I just want to say that usb cable unlocking worked for me where others failed

Not this one
I spent hours searching forms, for me too non of the free methods worked, until I combined some of them and made a thred, this will work, I just did it myself
I just posted to xda http://forum.xda-developers.com/showthread.php?p=48174440#post48174440
navy2012 said:
I searched and see some people are having the same problem as I do.
My problem, I can not get my ATT galaxy S4 SGH-I337 to unlock. I tried the free method. I bought code, two places, got the same code. But no luck on unlocking this bad boy. Anyone figured out how to unlock it yet? What can I do?
Click to expand...
Click to collapse

[Q] How to Sim-unlock AT&T SGS4 on UCUAMF3 firmware

I want to sim-unlock my at&t sgs4. please help! i asked at&t for unlock codes, it too didnt work!
i tried all the methods posted here on xda developers.. can anyone please help!

wtj16 said:
I want to sim-unlock my at&t sgs4. please help! i asked at&t for unlock codes, it too didnt work!
i tried all the methods posted here on xda developers.. can anyone please help!
Click to expand...
Click to collapse
I too experienced problems unlocking my I337M device (not AT&T, it's the Canadian version, hence the "M" in device model). After trying the keypad menu method and failing, I tried sending my IMEI number into a website to generate a key, but apparently the Samsung servers were experiencing a global delay and they refunded me after two days. (This delay was confirmed from multiple sources.) I then tried a tethered method using an application offered by an unlocking website. It cost $15 (compare at $35 for the IMEI method) and it worked instantly! This was after two days' worth of trying other methods. I won't give you the exact link, but if you google "fastgsm", it should come up. Make sure it's the tethered method. Good luck.

thanx!
Te3k said:
I too experienced problems unlocking my I337M device (not AT&T, it's the Canadian version, hence the "M" in device model). After trying the keypad menu method and failing, I tried sending my IMEI number into a website to generate a key, but apparently the Samsung servers were experiencing a global delay and they refunded me after two days. (This delay was confirmed from multiple sources.) I then tried a tethered method using an application offered by an unlocking website. It cost $15 (compare at $35 for the IMEI method) and it worked instantly! This was after two days' worth of trying other methods. I won't give you the exact link, but if you google "fastgsm", it should come up. Make sure it's the tethered method. Good luck.
Click to expand...
Click to collapse
Thanx. I will try this method and get back to you. Hope it works!

Te3k said:
I too experienced problems unlocking my I337M device (not AT&T, it's the Canadian version, hence the "M" in device model). After trying the keypad menu method and failing, I tried sending my IMEI number into a website to generate a key, but apparently the Samsung servers were experiencing a global delay and they refunded me after two days. (This delay was confirmed from multiple sources.) I then tried a tethered method using an application offered by an unlocking website. It cost $15 (compare at $35 for the IMEI method) and it worked instantly! This was after two days' worth of trying other methods. I won't give you the exact link, but if you google "fastgsm", it should come up. Make sure it's the tethered method. Good luck.
Click to expand...
Click to collapse
The FASTGSM website says:- Warning
Check your phone’s software version by going to Settings > About device. If Baseband version ends with MI1 or later (e.g. MJ1), your phone is not supported for USB unlocking. Use a different unlock method or downgrade your phone’s firmware.
And iam on mf3. So i think it should work!( f comes before i)

I used the FastGSM tethered method, and it worked on my MF3 stock rooted rom. Granted, I do not have MF3 bootloaders, but it otherwise seemed to work. The instructions included inside the program have you dial *#0808#, but other instructions (like the ones on their website) have to go and install a bunch of crap to your phone and dial some other number, but I found the *#0808# will get you straight to the options you need to switch your phone over to DM mode. Also don't forget to switch it back to MTP + ADB (or MTP-only if you don't want ADB debugging on).
EDIT: also make sure you have a completely unfiltered network connection. I tried it on my work's "guest" wireless that has far fewer restrictions, but it blocks something within FastGSM's app that reaches out to their servers right before performing the unlock. It's a safety to avoid them handing out a bunch of free unlocks.
Also! I forgot that I didn't have a 100% success. It didn't unlock the phone by itself, but it did at least provide me the network unlock code. I manually entered this on my phone and it worked the first time. Don't try entering the code multiple times if it doesn't work the first time! Save a copy of the log it makes, but don't post it here (includes IMEI).

wtj16 said:
The FASTGSM website says:- Warning
Check your phone’s software version by going to Settings > About device. If Baseband version ends with MI1 or later (e.g. MJ1), your phone is not supported for USB unlocking. Use a different unlock method or downgrade your phone’s firmware.
And iam on mf3. So i think it should work!( f comes before i)
Click to expand...
Click to collapse
did fastgsm work for you? as i am on UCUAMF3 via OTA update and i am trying to do it but i get an error "Establishing communication with phone....{Fail}
i am not rooted but can root if neccessary?
i have installed samsung usb drivers from the samsung official website but have never installed Kies.
Please Help

hemsmaverick said:
did fastgsm work for you? as i am on UCUAMF3 via OTA update and i am trying to do it but i get an error "Establishing communication with phone....{Fail}
i am not rooted but can root if neccessary?
i have installed samsung usb drivers from the samsung official website but have never installed Kies.
Please Help
Click to expand...
Click to collapse
I have tried using their usb method and it didnt work and they give me full refund.
I tried free method many many many times with original firmware and the lastest and it failed everytime. I even got the unlock code from att and it also didnt work. I was able to get my phone replaced because of the unlock code didnt unlock the phone. They gave me hard time but i was able to get replacement.
The replacement had the latest firmware, so i didnt try the free method or usb unlock, i just got the code from att and it worked. The free unlock method def. does something that prevents the phone from being unlocked.

PopcornKiller said:
I have tried using their usb method and it didnt work and they give me full refund.
I tried free method many many many times with original firmware and the lastest and it failed everytime. I even got the unlock code from att and it also didnt work. I was able to get my phone replaced because of the unlock code didnt unlock the phone. They gave me hard time but i was able to get replacement.
The replacement had the latest firmware, so i didnt try the free method or usb unlock, i just got the code from att and it worked. The free unlock method def. does something that prevents the phone from being unlocked.
Click to expand...
Click to collapse
I have a Same Problem by G4 has 4.2.2 UCUAMF3 Stock Rom. I can't root it via Odin or Change to I337UCUAMDB or I337UCUAMDL version, what's wrong with Stock and Can I change to other ones to unlock it, I bought unlock code and it said successfully unlocked. but does not work

paata01 said:
I have a Same Problem by G4 has 4.2.2 UCUAMF3 Stock Rom. I can't root it via Odin or Change to I337UCUAMDB or I337UCUAMDL version, what's wrong with Stock and Can I change to other ones to unlock it, I bought unlock code and it said successfully unlocked. but does not work
Click to expand...
Click to collapse
From what I've seen on xda it appears that if you have mf3 firmware the sim unlock does not work. It's just an observation and I may be wrong.

jd1639 said:
From what I've seen on xda it appears that if you have mf3 firmware the sim unlock does not work. It's just an observation and I may be wrong.
Click to expand...
Click to collapse
I will try FASTGSM USB method now and report results

I couldn't make fastgsm usb method work. I wonder if it works for you.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app

nsical said:
I couldn't make fastgsm usb method work. I wonder if it works for you.
Sent from my SAMSUNG-SGH-I337 using xda app-developers app
Click to expand...
Click to collapse
I tried it 15 minutes ago, it doesn't work. Failed while attempting to connect. Some security is blocking everything, no downgrade, no unlock. Idk what to do

I just did the chat with international care and they gave me the code. The code worked when I inserted the T-Mobile sim card

xisruno said:
I just did the chat with international care and they gave me the code. The code worked when I inserted the T-Mobile sim card
Click to expand...
Click to collapse
Can you please, give me contact information, I want to try it. How much is unlock code? u have MF3 right?

paata01 said:
Can you please, give me contact information, I want to try it. How much is unlock code? u have MF3 right?
Click to expand...
Click to collapse
Use the chat option to the lower right of the screen
http://www.att.com/esupport/travelAndIntl.jsp?cv=820
I am on MF3 and they did not charge me anything

This is exactly how I have unlocked all of my devices on AT&T. I just chat with international support, tell them I am going out of country and would like to use my phone there. They ask for the IMEI and within a minute give me an unlock code. Never had anyone say no, and never had issues. Unlocked S2, S3, S4, Atrix. All phones except S3 purchased on contract and still no problems.
Idk why anyone would pay $35 for something that is so easy and free and the unlock code is guaranteed to work.

geoldr said:
This is exactly how I have unlocked all of my devices on AT&T. I just chat with international support, tell them I am going out of country and would like to use my phone there. They ask for the IMEI and within a minute give me an unlock code. Never had anyone say no, and never had issues. Unlocked S2, S3, S4, Atrix. All phones except S3 purchased on contract and still no problems.
Idk why anyone would pay $35 for something that is so easy and free and the unlock code is guaranteed to work.
Click to expand...
Click to collapse
Thanks I will try to do so, problem is my device is blacklisted. will I still be able to unlock it? I bought it from craigslist and seller blacklisted it after a week.

geoldr said:
This is exactly how I have unlocked all of my devices on AT&T. I just chat with international support, tell them I am going out of country and would like to use my phone there. They ask for the IMEI and within a minute give me an unlock code. Never had anyone say no, and never had issues. Unlocked S2, S3, S4, Atrix. All phones except S3 purchased on contract and still no problems.
Idk why anyone would pay $35 for something that is so easy and free and the unlock code is guaranteed to work.
Click to expand...
Click to collapse
Thanks, AT&T international care gave me unlock code which was the same I got from http://myunlockedphone.com/, but unfortunately I can't unlock it yet, I tried free unlock and may damaged something, how Can I restore everything to default including Service mode menu.

paata01 said:
Thanks, AT&T international care gave me unlock code which was the same I got from http://myunlockedphone.com/, but unfortunately I can't unlock it yet, I tried free unlock and may damaged something, how Can I restore everything to default including Service mode menu.
Click to expand...
Click to collapse
I had the same exact issue, I called AT&T and had them replacement my phone under warranty.

PopcornKiller said:
I had the same exact issue, I called AT&T and had them replacement my phone under warranty.
Click to expand...
Click to collapse
Yes I managed to unlock it, it turned out seller blacklisted device, and I was trying to use Simple Mobile, AT&T and T Mobile (simplbo) share blacklist database

Bootloader e15a

I have some question, in most tutorials say that is highly dangerous try unlock bootloader with 11w29+, but some people unlock with no problem...
So.... is there any experience with 12w24 or some "12wxx" device?
I have keep this phone for years unused and never try to unlock because the serial N°, maybe with years passed someone find another safe way.
Thanks in advance.

Mr. Zero said:
I have some question, in most tutorials say that is highly dangerous try unlock bootloader with 11w29+, but some people unlock with no problem...
So.... is there any experience with 12w24 or some "12wxx" device?
I have keep this phone for years unused and never try to unlock because the serial N°, maybe with years passed someone find another safe way.
Thanks in advance.
Click to expand...
Click to collapse
Hi, as you've mentioned before, it's highly dangerous to do that, but you also have a low chance to sucessfully unlock it.
Ir you want to try, do it at your own risk.

Anyone can unlock Sprint LG V20 remotly ?

When i pop in my t-mobile sim card, the phone does not recognize it or prompt me for a network code or anything ? anyone know of someone or a service to sim unlock the sprint variant ? Thank you

Bump

I'm also trying to figure this out, as I am not able to even connect to T-Mobiles server to trigger the unlock. All that my unlock app does is just sit there with a spinning wheel and say " connecting to server, please wait " , so if I cannot get passed that than I'm screwed cause it's gotta at least prompt me if I want to unlock permanently or temporary. Darn thing just keeps spinning like I'm blocked from even connecting. Can someone who is rooted check to see if their phone will prompt for an unlock or not? Thanks in advance!

anasrocks said:
When i pop in my t-mobile sim card, the phone does not recognize it or prompt me for a network code or anything ? anyone know of someone or a service to sim unlock the sprint variant ? Thank you
Click to expand...
Click to collapse
If the T-Mobile unlock app is on the Sprint version (Which I doubt) use this site https://www.unlockbase.com/phone-unlocking-service/tmobile-device-unlock-app-official-unlock/ otherwise you might contact them and find out if they can sim unlock it another way. Or sideload the T-Mobile Unlock app and see if it works that way (I doubt this would work but you never know til you try)
shojus said:
I'm also trying to figure this out, as I am not able to even connect to T-Mobiles server to trigger the unlock. All that my unlock app does is just sit there with a spinning wheel and say " connecting to server, please wait " , so if I cannot get passed that than I'm screwed cause it's gotta at least prompt me if I want to unlock permanently or temporary. Darn thing just keeps spinning like I'm blocked from even connecting. Can someone who is rooted check to see if their phone will prompt for an unlock or not? Thanks in advance!
Click to expand...
Click to collapse
If you are rooted, it can detect it and it will stay on the spinning wheel. Only way I got it to work was to restore to stock no root and it worked (It kept giving me a unlock not available until I bought the unlock service from https://www.unlockbase.com/phone-unlocking-service/tmobile-device-unlock-app-official-unlock/ )

Dirty Santa sim unlocks the Sprint variant,not sure for T-Mobile

DarkestSpawn said:
If the T-Mobile unlock app is on the Sprint version (Which I doubt) use this site https://www.unlockbase.com/phone-unlocking-service/tmobile-device-unlock-app-official-unlock/ otherwise you might contact them and find out if they can sim unlock it another way. Or sideload the T-Mobile Unlock app and see if it works that way (I doubt this would work but you never know til you try)
If you are rooted, it can detect it and it will stay on the spinning wheel. Only way I got it to work was to restore to stock no root and it worked (It kept giving me a unlock not available until I bought the unlock service from https://www.unlockbase.com/phone-unlocking-service/tmobile-device-unlock-app-official-unlock/ )
Click to expand...
Click to collapse
I was thinking that it was because I was rooted , so I guess I will try and restore to an unrooted state and see if that makes a difference.

I found a guy on ebay who supposedly can unlock the Sprint V20 for $50.

preilly44 said:
I found a guy on ebay who supposedly can unlock the Sprint V20 for $50.
Click to expand...
Click to collapse
can u post a link or the guys name?

papoose515 said:
can u post a link or the guys name?
Click to expand...
Click to collapse
Don't bother. All he will do is already what you can do. Root your phone and use the US996 Rom on it(btw try that.)

me2151 said:
Don't bother. All he will do is already what you can do. Root your phone and use the US996 Rom on it(btw try that.)
Click to expand...
Click to collapse
so the us996rom is sim unlocked?

papoose515 said:
so the us996rom is sim unlocked?
Click to expand...
Click to collapse
The US996 roms are from an unlocked device. so yea.

anasrocks said:
When i pop in my t-mobile sim card, the phone does not recognize it or prompt me for a network code or anything ? anyone know of someone or a service to sim unlock the sprint variant ? Thank you
Click to expand...
Click to collapse
is the phone paid off in full? no more monthly obligation? if not that's the reason you can't unlock. it's because you don't own the phone sprint does. NO ONE can get a device unlocked from distributor without full payment fulfillment.
Sent from my LG-H918 using Tapatalk

djnikkofb said:
is the phone paid off in full? no more monthly obligation? if not that's the reason you can't unlock. it's because you don't own the phone sprint does. NO ONE can get a device unlocked from distributor without full payment fulfillment.
Sent from my LG-H918 using Tapatalk
Click to expand...
Click to collapse
It works fine if you have a rom thats unlocked(for some unknown reason.)

Anything on this?!!! Im about to buy a service but when I pop another sim it doesn't prompt the unlock code screen I heard there's a way to manually get there any help?! Dirty Santa does the trick I heard but rooting the v20 is not easy and I heard lots of side effects

Anyone can unlock Sprint LG V20 remotly ? by anasrocks
me2151 said:
It works fine if you have a rom thats unlocked(for some unknown reason.)
Click to expand...
Click to collapse
Can the T-Mobile LG v2o use that rom?

boss315man315 said:
Can the T-Mobile LG v2o use that rom?
Click to expand...
Click to collapse
You can try it. i dont know if it will or wont work.

me2151 said:
You can try it. i dont know if it will or wont work.
Click to expand...
Click to collapse
So did the ROM let you use any carrier sim?

boss315man315 said:
So did the ROM let you use any carrier sim?
Click to expand...
Click to collapse
Supposedly yes. i never tested it.

yes sprint unlocks it remotely that is what they did with mine, once I called in they had you run the uicc unlock option in updates. it will say uicc unlocked successfully.

DarkestSpawn said:
If you are rooted, it can detect it and it will stay on the spinning wheel. Only way I got it to work was to restore to stock no root and it worked (It kept giving me a unlock not available until I bought the unlock service from https://www.unlockbase.com/phone-unlocking-service/tmobile-device-unlock-app-official-unlock/ )
Click to expand...
Click to collapse
I have this the same spinning wheel Iand Im unable to unlock my phone. Is it hard to go back to stock and redo it again?

Problem with G930AZ Unlock

I havent been able to unlock my phone phone i bought it off ebay and i cant seem to unlock it. i bought the unlock code from two different unlock servers and they both appeared with the same code but it doesnt work i was wondering if anyone has had this same problem and was able to fix it. i would apreciate the help thanks in advance.

You have to wait a while for the unlock to go through. I've never unlocked my phone but I've seen videos so I have some knowledge

Flare_x13 said:
I havent been able to unlock my phone phone i bought it off ebay and i cant seem to unlock it. i bought the unlock code from two different unlock servers and they both appeared with the same code but it doesnt work i was wondering if anyone has had this same problem and was able to fix it. i would apreciate the help thanks in advance.
Click to expand...
Click to collapse
Something happened with OS in your phone. Maybe it was rooted, or maybe some error in the system. Any how. Just flash your phone with stock rom. The original firmware that it had, and the code should work. Also try factory reset first. That may work as well.
Good luck.

Pm me i'll unlock it for u for free

instrumentaly said:
Pm me i'll unlock it for u for free
Click to expand...
Click to collapse
Yoy can tell me how ?

Flare_x13 said:
I havent been able to unlock my phone phone i bought it off ebay and i cant seem to unlock it. i bought the unlock code from two different unlock servers and they both appeared with the same code but it doesnt work i was wondering if anyone has had this same problem and was able to fix it. i would apreciate the help thanks in advance.
Click to expand...
Click to collapse
That's maybe cuz it's network unlock... You need frp unlock???
I can't seem to get the correct eng boot or combo firmware for mine... I can't seem to unlock mine and I've done it on a few others.... Not the cricket model tho...
Sent from my [device_name] using XDA-Developers Legacy app

JeepinxJosh said:
That's maybe cuz it's network unlock... You need frp unlock???
I can't seem to get the correct eng boot or combo firmware for mine... I can't seem to unlock mine and I've done it on a few others.... Not the cricket model tho...
Click to expand...
Click to collapse
yeah it was a network lock and yes i know what im doing and nope i had to use a combination of msl code and then use the pin. it was a new type of security back then.
can uou describe your problem what build number are you on what version of adroid

Flare_x13 said:
yeah it was a network lock and yes i know what im doing and nope i had to use a combination of msl code and then use the pin. it was a new type of security back then.
can uou describe your problem what build number are you on what version of adroid
Click to expand...
Click to collapse
ok I have a g930az... (s7) frp locked... ex girlfriend thought it would be funny... it's not...im on US4AQA1 firmware6.0.1/mmb29m/930aztus4aqa1 user/release-keys
I thought since I was on MM I could do this with no issue... but everytime I flash anything but pure stock all 4 firmware files I can't boot past the splash screen... bootlooop on off on off... forever... I have tried every 930u a and v combofile and qc engboot file I could find... I've done the FRO unlock on many before this but this one is nuts... i think she may have done something else I dunno/..