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Help Need a sim network unlock pin..

Hello everyone.

I'm a new member on here :) I'm excited to explore the site and meet new people.

SITUATION- recently, I bought a Motorola Bravo (AT&T) off of an ad through CraigsList.

when i purchased it, i had to do the "unlock" method on my own due to my boyfriend exceeding the unlock pattern attempts.

the other night, i tried putting a T-Mobile SIM in it and it asked for a SIM NETWORK UNLOCK PIN. so then i tried a SimpleMobile SIM and it asked for the same!

Q: do i need a SIM UNLOCK NETWORK PIN for at&t (since that's the original carrier)?? or can i get a SUNP for one of the other sim cards i have???
-PLEASE HELP!! I'm WITHOUT a phoneeeee!!! :(


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