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Unlocking Lumia 900 -- AT&T SIM/Network Lock Code Is Incorrect - FIXED! You've probably found your way here because you're trying to use an unlock code that you got from AT&T or an EBay seller, but the phone is refusing to take it, despite your triple-checking of details. The workaround is...

Unlocking Lumia 900 -- AT&T SIM/Network Lock Code Is Incorrect - FIXED! You've probably found your way here because you're trying to use an unlock code that you got from AT&T or an EBay seller, but the phone is refusing to take it, despite your triple-checking of details. The workaround is...

Nokia Care Suite Tutorial - YouTube Nokia Care Suite Tutorial

Unlocking Lumia 900 -- AT&T SIM/Network Lock Code Is Incorrect - FIXED! You've probably found your way here because you're trying to use an unlock code that you got from AT&T or an EBay seller, but the phone is refusing to take it, despite your triple-checking of details. The workaround is...

no att sim lol

Hey Alex thanks for your reply, this method that you mentioned does not work on nokia lumia 900. I don't think it would make a difference how i do it, the problem is they gave me the wrong unlock code

i got two nokia lumina 900's, one unlock code that they provided was good, the second unlock code for the second phone is not good I got the unlock code from AT&T. However, it just doesn't work. When I was asked for an unlock code on Lumia 900, I input the 8 digits code, press Enter, and it said...