[Completed] Need help with at&t samsung galaxy s4 sgh-1337 - XDA Assist

Hello
i bought an at&t samsung galaxy s4-sgh1337
i unlocked it without the at&t unlock code
so now i need to get the android 5 update .. but i cant because i get the updates through at&t software update
i contacted at&t and got my official unlock code ...
the problem is that the mobile us already unlocked
is there in way to re-lock the mobile .. so i can unlock it with at&t unlock code ?

XDA Visitor said:
Hello
i bought an at&t samsung galaxy s4-sgh1337
i unlocked it without the at&t unlock code
so now i need to get the android 5 update .. but i cant because i get the updates through at&t software update
i contacted at&t and got my official unlock code ...
the problem is that the mobile us already unlocked
is there in way to re-lock the mobile .. so i can unlock it with at&t unlock code ?
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Greetings,
Thank you for using XDA Assist. Please have a look at the homepage for your device:
Samsung Galaxy S 4 SGH-I337
Most helpful information and guides can be found in the General section. If you create an XDA account, you can post your questions in the Q&A section also located there. Good luck and welcome to XDA!

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I found these threads about unlocking your device:
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Hello, and welcome to XDA! For help with the S5 generally, you can register and post your question here:http://forum.xda-developers.com/galaxy-s5/help For help with the T-Mobile version in particular, go to: http://forum.xda-developers.com/tmobile-galaxy-s5/help
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XDA Visitor said:
I got a sim-free phone Samsung Galaxy J1 SM-100H from the UK and am based in Africa. I do not know the carrier the phone is locked to as it says SIM network unlock code when I put in a local sim. How can i find out the carrier the phone is locked to? And is it possible I can unlock it online for free or for a cost? Thanks..!
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