Foreign SIM doesn't prompt for unlock code -- how to unlock?

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I have a SaskTel Samsung Galaxy S3 (SGH-I747M, baseband version I747MVLLE8) that is locked, and I want to unlock it. But when I insert a foreign SIM (from AT&T) I get no prompt for an unlock code. Instead it just says "No SIM card. Emergency calls only." I've contacted several of the online unlock code suppliers and they say without this prompt I can't unlock the phone. I've also tried to enter variations of the *7465625* code, but they do nothing at all. SaskTel says they don't provide unlock code. This despite the fact that I purchased the phone outright, and have no contract with them. Am I totally hooped, or is there some way I can get this phone unlocked?

Originally Posted by ddice

I have a SaskTel Samsung Galaxy S3 (SGH-I747M, baseband version I747MVLLE8) that is locked, and I want to unlock it. But when I insert a foreign SIM (from AT&T) I get no prompt for an unlock code. Instead it just says "No SIM card. Emergency calls only." I've contacted several of the online unlock code suppliers and they say without this prompt I can't unlock the phone. I've also tried to enter variations of the *7465625* code, but they do nothing at all. SaskTel says they don't provide unlock code. This despite the fact that I purchased the phone outright, and have no contract with them. Am I totally hooped, or is there some way I can get this phone unlocked?

try another SIM, maybe the one you're using is borked.

Try this
#7465625*638*# (Insert Network Lock Keycode)

Sent from my SGH-I747M using xda app-developers app

Originally Posted by cue_32

Try this
#7465625*638*# (Insert Network Lock Keycode)

Sent from my SGH-I747M using xda app-developers app

I've already tried that, the phone doesn't respond to this keystroke sequence.

Originally Posted by dLo GSR

try another SIM, maybe the one you're using is borked.

Possible, but I doubt it, since it works just fine in another phone. In any case I don't have another one to try.

Misread

#7465625*638*UNLOCKCODE#

I noticed in an earlier post, the place of the unlock code was after the #, it should be before. On the right track though. Probably just a typo.

unless you already tried that.

Originally Posted by lamsik

#7465625*638*UNLOCKCODE#

I noticed in an earlier post, the place of the unlock code was after the #, it should be before. On the right track though. Probably just a typo.

unless you already tried that.

That and probably every variation of it I can think of! I am wondering though, is this code internal only to the phone, or does it go to the cellular network? When I do type it, it does nothing, though if I send it I get an "Invalid USSD" message returned from the network.

Originally Posted by lamsik

#7465625*638*UNLOCKCODE#

I noticed in an earlier post, the place of the unlock code was after the #, it should be before. On the right track though. Probably just a typo.

unless you already tried that.

this code doesn't work on the LTE variants of the SGS3. most of the multi-stage codes (####*###) don't work, you just end up with an error.

Correct as stated. Additionally, if you have a foreign micro sim, and you are not on a stock ROM, the unlock screen prompt will not show. I was running AOKP, and could not get the prompt to show, so I flashed back to stock, unlocked phone, then flashed back to AOKP, bc TW sucks!

Sent from my SAMSUNG-SGH-I747 using xda premium