yashsingh1/xdaforums huggingface dataset:
[AT&T Samsung Galaxy S 4 General] s_m_a_s_h:
Ask a friend/family to borrow their sim (of another carrier) and once the phone has booted it should register automatically to that specific network carrier, this'll prove the unlock successful.

Note.

However, if you're friendless and/or can't ask a family member, then this method is impossible to prove, the only alternative is to buy a PAYG sim [from an alternative carrier] it'll be cheaper than a new contract sim.

---

smash'n

SGS2 GT-I9100
[AT&T Samsung Galaxy S 4 General] quitofire532:
Well, on the upside, it worked on my Rogers i337m. Confirmed with my Telus SIM. The downside to that is it reset everything on my device. I had to set it up new.
[AT&T Samsung Galaxy S 4 General] aguacateojos:
Thanks, I figured that was the case - everyone in my house uses AT&T.

Additionally, I can't tell if this is all in my head... but before I attempted this method I had pretty solid 4G / LTE going in in my apartment. I Odined from mdb to mdl, then tried this unlock method and now I seem to have a significantly poorer connection... but it could be either of those factors... or just in my head...
[AT&T Samsung Galaxy S 4 General] TwoStroker37:
Menu unlock doesn't unlock AWS like a factory unlock does. You'll have to edit the NVRAM flag to open the frequencies.

Sent from my S4 Active unlocked and rooted on TMO
[AT&T Samsung Galaxy S 4 General] aguacateojos:
True, but wouldn't that only be necessary if I was on Tmo? As per my last post, I'm on AT&T and don't know someone with a non-AT&T SIM to check if the unlock worked... so I should already have those frequencies working, right?
[AT&T Samsung Galaxy S 4 General] mikebb00:
I'm in process of switching my service to T-Mobile from AT&T, if I follow the steps #1, #2, #3, EXACTLY - the additional main menu on ServiceMode doesn't show-up, it used to display prior to the most recent update deployed from AT&T. Any Ideas? thx
[AT&T Samsung Galaxy S 4 General] redhawk74:
I am trying this method. when i type *#0011# it goes to service mode. Then i hit menu button and back in the menu. Then i hit menu an key input. Then i type 1 and ok. My problem here is the screen is not changing to the service menu. Just reverts to screen seen after *#0011# is entered. Any ideas anyone?
[AT&T Samsung Galaxy S 4 General] Stoneyguy:
Thanks for the heads up! :good:
[AT&T Samsung Galaxy S 4 General] lawbo:
Try many times, it didn't work on my ATT S4
[AT&T Samsung Galaxy S 4 General] elrooster:
It does work on ATT S4, maybe you are doing something wrong, like using the physical back button instead of back in the menu options

I can confirmed that this method works
[AT&T Samsung Galaxy S 4 General] done12many2:
I can tell you that all of the steps worked fine on my AT&T S4 and it rebooted as the OP's instructions stated. Does the fact that all the steps went as described mean that it's now unlocked? I don't know as I don't have a SIM from another carrier to test with. I can confirm that the steps themselves do work.
[AT&T Samsung Galaxy S 4 General] rizzo269:
Thanks for posting. Don't have a sim to try but it looks like others have confirmed its working.
[AT&T Samsung Galaxy S 4 General] Spunjah413:
Followed every step as OP written, rebooted afterwards. I do not have another sim to test, so is there any other way to tell that it is now unlocked?
[AT&T Samsung Galaxy S 4 General] johnus:
Well, it locked up with the blue light as mentioned, rebooted and is now running fine...so it seems to have worked as described for me! I don't have another carrier's SIM to test it with, though. But thanks!
[AT&T Samsung Galaxy S 4 General] Android3220:
Worked for my s4 att. Just tried my demo line sims from tmobile. Thanks!!
[AT&T Samsung Galaxy S 4 General] 97prelude:
This method as well as the following methods DID not work on my 32gb att GS4.... I have a tmobile sim and it did not work.

1. http://xdaforums.com/showthread.php?t=2283068 <---- did not work

2. http://www.redmondpie.com/how-to-sim-unlock-samsung-galaxy-s4-gt-i9505-for-free/ <---- did not work
[AT&T Samsung Galaxy S 4 General] fizmixa:
can't even get past step 1 with my ATT S4. "Connection problem or invalid MMI code"
[AT&T Samsung Galaxy S 4 General] sd_N:
It works
[AT&T Samsung Galaxy S 4 General] scott14719:
Yea, I went through the motions and it all went as described. I have to go get a T-Mobile sim to check it out. I have one, but it is a full size sim and not a micro sim.
[AT&T Samsung Galaxy S 4 General] tosh1:
Everyone better hurry and unlock before att pushes out an update to block this. .or is that even possible? Going to try it when I get home. .
[AT&T Samsung Galaxy S 4 General] thuglifesk:
the steps worked for me on I337M on Bell, but don't have a micro sim to test at the moment.
[AT&T Samsung Galaxy S 4 General] phil.W:
Tried it using an MTS S4 from Canada, seems to work, though I haven't tried a new sim in it it went through the regular process listed above though I had issues trying to find the UMTS screen which I needed to then go through search line and press [1] to get to it however

Thanks once again for posting this up, love samsung and how they don't make you buy ****ty codes to unlock your phones. Did something like this for my note 2 thanks to xda and the great community we have here
[AT&T Samsung Galaxy S 4 General] techguy41:
tried it but it lead me to recovery options

Hi I followed all the steps and when it rebooted, it went to the recovery options mode. Pressed reboot and it keeps cycling back to the recovery options.

I had to factory reset to get it back on.

is that normal?

My phone was rooted and everytime I try to root it keeps sending me to the recovery options screen.

can someone help me with this?
[AT&T Samsung Galaxy S 4 General] fosser2:
I attempted this on a AT&T S4. Steps followed and worked just fine. Will have to get another sim to verify it actually unlocked. Thanks!
[AT&T Samsung Galaxy S 4 General] Phoneguy589:
This just sim unlocks, it doesn't unlock the bootloader.
[AT&T Samsung Galaxy S 4 General] aaronc_98:
I tried this on my 32 gb ATT as well and when I put a tmob sim it says that it is a network lock sim asking me for the unlock code, so it appears that it did not work for me.
[AT&T Samsung Galaxy S 4 General] bhp090808:
For those it doesnt work for follow same instructions but start with *#9090#.

Did the trick for me

Sent from my Nokia 5120. Rocking it oldschool
[AT&T Samsung Galaxy S 4 General] Zoide_:
Has anyone gotten this to work on an AT&T Galaxy S4 (SGH-I337) with the I337UCUAMDL firmware?

I followed all the steps (inserted an authorized AT&T SIM, set PERSO SHA256 to OFF, did a backup restore, etc.) but it still asks for an unlock code when I try another carrier's SIM card. Perhaps I need to downgrade to I337UCUAMDB first?

Thanks
[AT&T Samsung Galaxy S 4 General] gentleman559:
Im having the same issue. God, AT&T pisses me off. I bought this phone today to use on T-Mobile considering how easy it would be to SIM unlock it for free, get it rooted and running the Google edition ROM. Well, if I wasnt double F***ed today. No root available for the MF3 firmware which I happen to have and the SIM unlock no longer works due to this new update. Ugh, its no wonder I have T-Mobile I just cant stand this kind of BS that AT&T and Verizon constantly pulls. If I wasn't so worried about shady people selling T-Mobile phones then them being blocked shortly there after this wouldn't even be an issue. Sorry just venting. LOL
[AT&T Samsung Galaxy S 4 General] Zoide_:
Just wanted you guys to let you know:

I'd tried the hidden menu method and it failed. Then I bought a SIM unlock code from a website and it didn't work either (yes, I set PERSO SHA256 back to ON before entering it). Finally, as a last resort, I tried the FastGSM USB app and it worked :)

I have a black, 16GB AT&T Galaxy S4 (SGH-I337) running the MDL firmware.
[AT&T Samsung Galaxy S 4 General] shuweee:
FastUSB option worked for me as well after failing the hidden option.
[AT&T Samsung Galaxy S 4 General] mikebb00:
Do you have a link for FastUSB application? Thx

---------- Post added at 11:13 PM ---------- Previous post was at 11:04 PM ----------
[AT&T Samsung Galaxy S 4 General] hovax615@hotmail.com:
I had a question. So I did that hidden menu unlock before I updated to MF3 but didn't have any other sims to try it with cause everyone in the house has at&t and IPhones. The question I have is when I updated to MF3 did I lose the unlock I did with the hidden options?
[AT&T Samsung Galaxy S 4 General] egandt:
MF3 does not have the options for the free unlocking, found that out the hard way, select one of the previous Modems. Also could not use the unlock code with the MF3 modem and get it to work. An unlock code requires a stock firmware and an older modem to succeed.

ERIC
[AT&T Samsung Galaxy S 4 General] terahertz5k:
Mine worked on MDL.
[AT&T Samsung Galaxy S 4 General] Zoide_:
Thanks. In the end I bought an unlock code, but that didn't work either (even after turning PERSO SHA256 back on). I ended up using the FastGSM USB unlock program, which worked :)
[AT&T Samsung Galaxy S 4 General] hovax615@hotmail.com:
Yeah I know that MF3 doesn't have the free unlocking option. My question was I did it before I updated to MF3 so when I updated to MF3 I lost the unlock that I did on the older modem when I updated?
[AT&T Samsung Galaxy S 4 General] egandt:
No the unlock should remain for ever as I understand it. I know mine survived the MF3 upgrade.
[AT&T Samsung Galaxy S 4 General] pham818:
for those who tried to use it on another network, can you confirm that data such as hspa or lte working on it?

please reply with quote so that i get an email notification
[AT&T Samsung Galaxy S 4 General] madmajd:
did this on two separate phones, the first S4 worked perfectly, the other one didnt. The other one was brand new, i337M running 4.2.2, anyone have any idea why it didnt work? Do I need to do a downgrade like was required on the Note 2?
[AT&T Samsung Galaxy S 4 General] newbie2006:
bump same here.

Just got mine 4.2.2 and no option showing up as per the instructions. thats sucks... lol
[AT&T Samsung Galaxy S 4 General] bo8:
My first post!

Looks like the "newer" phones (vs. the originals that came out in "first batch") have been modified to invalidate this unlocking method.
[AT&T Samsung Galaxy S 4 General] sci05:
fastgsm virus

For those who unlocked with fastgsm, did you find a virus on the client software? My AVG is picking up Exploit_c.wpd.

Also for those who used fastgsm, anyone try it on a Bell device?
[AT&T Samsung Galaxy S 4 General] mzahs:
These programs usually have exploits needed for them to work and are not viruses usually (although there may be exceptions). I have some android exploits/programs which my antivirus flags as trojans/viruses when they are actually not.
[AT&T Samsung Galaxy S 4 General] bo8:
Did the fastgsm unlock on my corporate work desktop PC, WinXP, McAfee protected ... didn't raise any flags or pop-ups. tsk tsk McAfee! :p

mzahs is on the money. Exploit is needed in order to perform root operations. Googled "Exploit_c" and comments here include same.
[AT&T Samsung Galaxy S 4 General] mzahs:
Deleted
[AT&T Samsung Galaxy S 4 General] fmark:
I'm trying to unlock my Fido locked i337m S4. I'm running Rooted Stock MG1 rom with CWM recovery installed.

*#0011# takes me to the Service menu. However I'm not getting into the Main Menu mentioned in Step 3.

Am I missing something ? Could somebody help please ? Thanks!
[AT&T Samsung Galaxy S 4 General] fredmc2020:
My S4 just automatically installed a system update and I can no longer get to the Service Mode "Network Lock" screen. I can get into Service Mode "Diag Config" using *#9090# but the "back" button does nothing, just stays on the same screen. Same thing when using *#0011# and *#1111#.

*#27663368378# USED to work before I updated. Is this latest update a fix?! BUMMER.
[AT&T Samsung Galaxy S 4 General] WarbyParker:
Don't use the free method with Canadian phones. Very hit and miss. When you miss, people had a variety of problems that couldn't be fixed, such as LTE signals not being as good or not able to use an IMEI unlock anymore. The good thing the fastgsm method has saved some of our butts with their unlock method.

You're better off paying a few bucks for the unlock code without risking your phone.
[AT&T Samsung Galaxy S 4 General] fmark:
Thank you ! I'll probably buy an Unlock code.

While playing with free unlock I accidentally tried *#9090# and did Key Input->1->Ok. Phone rebooted but seems to work fine. I hope I did not break anything. I see that in the Service Menu (from *#9090#) I now have [1] DM/DUM over HS-USB(*) selected. Could somebody with Fido phone try "*#9090#" and let me know which option is marked by (*) ?

I have [1] DM/DUM over HS-USB(*) and [5] DBG MSG ON(*). Thank you !
[AT&T Samsung Galaxy S 4 General] rjohnstone:
Just tried this method on my AT&T GS4 and it worked fine.

My phone is still on MDL firmware, so I still have the debug menu.
[AT&T Samsung Galaxy S 4 General] ahfu25:
Will it cause problems with the att i337? I ended up getting the unlock code from att and it doesn't work :mad:
[AT&T Samsung Galaxy S 4 General] WarbyParker:
This is really a black box method, nobody knows what the golden backup changes at the firmware level.

If you restore the golden backup and it didn't unlock you phone, there's a high chance something went wrong.

This is proven by your AT&T unlock code not working.

Very important: Stop entering the code. Too many failed attempts will permanently lock your phone.

These are the two methods that people have been having success after failing the free method:

1. Use the fastgsm usb unlock method.

2. Find a store with an unlock box in your area.
[AT&T Samsung Galaxy S 4 General] ahfu25:
It also broke my wifi. Just came back from a service center and they confirmed wifi is broken. I told the tech what I tried to do and he said would still replace it but they didnt have anymore 32gb in stock. He called att and got them to ship me a warranty replacement with express shipping at no charge. Also he told me to go back on weds when hes there and he'll unlock it for me.
[AT&T Samsung Galaxy S 4 General] Taboltini:
"NV recovery" will solve this problem. I could not understand why it doesnt accept an unlock code.... Thank you for you post =) It helped me to figure out why.
[AT&T Samsung Galaxy S 4 General] TornSack:
Thanks

Worked like a charm!
[AT&T Samsung Galaxy S 4 General] G3N0M3:
MY ATT i337 worked perfectly fine in Europe.

Thanks again OP.
[AT&T Samsung Galaxy S 4 General] Taboltini:
Today I got unlock code for my i337 (att). I can say that it doesn't work for you if you've tried to use this method. To restore your phone, you have to:

1.) *#27663368378#

2.) [1] UMTS

3.) [6] COMMON

4.) [6] NV REBUILD

5.) Reboot your phone

6.) Enter an unlock code provided to you

Seems that it affects on some parts of operator settings. So I may not reccomend this method for permanent factory unlock.
[AT&T Samsung Galaxy S 4 General] Runit1:
Unlock code

I got an I337 and tried the PERSO off tried both a TELCELL and a T Mobile did not work. Tried turning it off on but after a few hours gave up. Broke down and spent 8 bucks for an unlock code should of done it in the first place for that price but just dont feel comfortable giving my IMEI out. But when I tried it did not work. Remember reading about turning PERSO back on again well did that then a Back up. Let it restart and enter code and it unlocked. Now both my TELCELL and T MOBILE work usng my dual sim adapter.
[AT&T Samsung Galaxy S 4 General] eddydy:
this worked for me

I used the first method in the very first post with an At&t S4, then I inserted my tmobile sim card and it worked

like a charm.

Thanks:cowboy:
[AT&T Samsung Galaxy S 4 General] Dillsnik:
is there any way to do an unlock while i am already away from my home network? this method doesn't seem to work as i can't access my service menus from the dialer.

i have an ATT phone on 4.2.2 custom rom and want to use a vodaphone sim i bought here in italy. ATT gave me an unlock code before i left but i am not getting it to work because i believe i am on the custom rom?

any help wouold be most greatly appreciated!
[AT&T Samsung Galaxy S 4 General] scott14719:
Being on a custom ROM should not matter. You should be able to put the other (non AT&T) sim into your phone and it should request an unlock code. If the AT&T code doesn't work there should be a reason. Did you try the "free menu unlock method" that has been posted, if so, you may have messed your phone up. Like mentioned, make sure you turn PERSO back ON if you tried the method and it did not work. Otherwise, you may have to go the route of finding somewhere that will USB unlock the sim. Others have had success with USB unlock when the "free unlock" method screwed their phones up.

You can search the general forum for more information that might help you. Good luck.
[AT&T Samsung Galaxy S 4 General] Dillsnik:
yes i tried the free menu unlock method posted in the OP of this thread, and als this method

http://xdaforums.com/showthread.php?t=2283068

i am wondering if these mothodds will only work performed on a phone that currently has working service on it at the time because i am not getting the menus to launch. would you suggest those methods should work with the non-att sim card? i tried it with my att sim in and the vodaphone one and neither took me into any kind of menu screen. i hope i didn't mess it up by entering a code too many times.

with either sim in when i am trying these methods i get a "mobile network not detected" message after i hit the "dial" button...i am not sure if that is the "ok" button as mentioned in one of the methods posted. also, in the method posted in the OP it says to dial the digits specified, then the menu button, the back button, then select key input. i don't know if that means just tap finger into the dialer display to enter "1" for the next step, or there should be an option in the menu for "key input" either way i am not having success getting the menu to come up at all so not exactly sure what i am doing wrong
[AT&T Samsung Galaxy S 4 General] scott14719:
If you are on MF3 firmware (the latest OTA) the service menu will not work. However, you mentioned you are using a custom ROM, so you can't be on MF3.

Like I mentioned, the free unlock method has been known to screw people's phones up. There are several warnings throughout that thread the mention it.

If AT&T's code does not work, your only other option will be to USB unlock the sim. Again, this is mentioned several times in the "free unlock" thread as well as being mentioned in many other threads. A search of the forums will help you find the information if you can't seem to find the threads by visually looking for them.

According to the OP of the link you posted, the phone does need to be on stock ROM for the service codes to work but at this point, you should probably just find a place to USB unlock the phone because you have tried the method unsuccessfully so many times, and, if you go back to the stock ROM you will need to redo or reset certain aspects of the ROM if you decide to go back to a custom ROM ...if the service menu even works then. So just USB sim unlock it and be done with it. Good luck.
[AT&T Samsung Galaxy S 4 General] illtriniboy20:
Hi,

I have followed the instructions and I had thought it worked. Now my phone says Invalid SIM card. Network locked SIM card inserted. This is with my SIM card that came with the phone. I am with Bell in Toronto, Canada. I tried a factory reset from teh security menu but it still doesn't work. When I login with my bell unlock key from the website it says unsuccessful. Could anyone help me out to get my SIM working, I don't even care about being unlocked anymore.

Thank you
[AT&T Samsung Galaxy S 4 General] jball:
OK so the method did work for me .I popped in a prepaid T-Mobile Sim and no prompt for unlock code.however I didn't get service and thought there was a problem with APN or something else related to the onlock procedure. Nope I just had to go outside for the phone to connect to the crappy Edge 2 singnal that T-Mobile supports for my area.LOL
[AT&T Samsung Galaxy S 4 General] Jpolola:
Galaxy s4 Japan

Do I need to insert the original sim (Authorized sim) or No Sim inserted on this procedure.? I follow the instruction carefully but I stuck on service mode, after I input 1. I can see 1 but no umts behind it. help please..
[AT&T Samsung Galaxy S 4 General] santhikiran4110:
worked

unlocked on the first attempt,

model---- i337:good:
[AT&T Samsung Galaxy S 4 General] Dillsnik:
i am still stuck not being able to access any service menus...any advice greatly appreciated
[AT&T Samsung Galaxy S 4 General] scott14719:
The best advice you will ever get about this is to stop using the service menu for this. Get an unlock code from AT&T or buy one from one of the proven unlock sites and use the code while you still can. If it's already too late, maybe USB unlock will still work for you.

The service unlock menu is not a safe method for sim unlocking the phone.
[AT&T Samsung Galaxy S 4 General] Dillsnik:
hey scott, ,thanks again for your help.

I am trying to use a USB unlock from a reliable source. but their method still requires you to change some settings in some of the service menus. i don't know why i can't get them to come up, but it is very frustrating as i have been at this for days and need to gain use of this phone over here.
[AT&T Samsung Galaxy S 4 General] scott14719:
Unfortunately, the only other thing I can think of is for you to ODIN back to stock and try it. I know you didn't want to go that route, but I don't see any other options. Of course, make sure you don't take the MF3 update if it prompts you. Maybe there are programs out there that will help access the service menu, but I am not aware of any and have not tried any, but it might be worth a look. Make a nandroid of your current ROM before you ODIN. After you Odin to stock (assuming the service menu appears, and you don't update to MF3), re-install whatever custom recovery you are currently on, reflash whatever ROM you are currently on, and then, if everything is working right, restore the nandroid so you get everything back the way you have it now. Hopefully, you will have the extra bonus of being sim unlocked as well. Good luck.

Oh, and if you do the ODIN method, try the AT&T code first before you try anything with the service menu. Using a code is always better (if you can) than using the service menu.
[AT&T Samsung Galaxy S 4 General] Goodborn:
Fido i337m galaxy s4

Tried this method on my Fido S4 rooted on MDJ firmware and seems like it worked. Popped in my wife's Rogers sim and phone and 4G is working normal. Would like to test it down the road with Telus, Koodo or Bell to see if they work as well. Worked 1st shot
[AT&T Samsung Galaxy S 4 General] ma678:
Fido and Rogers can swap SIM card without unlocking.

Try SIM card from bell or telus.
[AT&T Samsung Galaxy S 4 General] illtriniboy20:
Did this method make anyone else's phone permanently locked to all carriers? After trying this I get the message SIM network unlock PIN at startup and it says Network locked SIM inserted. I didn't even change my SIM, its still my bell SIM with my bell phone. Now i can't connect to any network and I can't use my phone.

any help would be appreciated. thank you.
[AT&T Samsung Galaxy S 4 General] Goodborn:
I don't think that's true. My Fido sim will not work in my wife's Rogers iphone. I heard something like that before but that may have been a while ago or with older phones cause it hasn't worked with me
[AT&T Samsung Galaxy S 4 General] ma678:
IPhone maybe different story, though. Android is likely able to swap without problems.
[AT&T Samsung Galaxy S 4 General] milicigoran:
I just got back from a 5 week trip to Europe and can say this method works. When I got there I took out my sim and popped in a pre paid Vodafone and it worked. Use my phone without a problem. Only problem was I missed my LTE. Those old speeds are so slow.
[AT&T Samsung Galaxy S 4 General] scott14719:
I'm glad it worked for your phone, but it doesn't for all..