I need to unlock my Samsung Galaxy S3 on Sprint so I can use it on AT&T. Help, please. Thanks.
Even if you unlock it, it will NOT
work on AT&T because AT&T is GSM
while Sprint is CDMA
Basically, if the phone works on Sprint, it won't work on AT&T and vice versa.
GSM (AT&T, T-Mobile)
CDMA (Verizon, Sprint) it will work with Verizon if you unlock though.