Thanks Meter 223
Join Date: Nov 2013
Location: Bandung, Indonesia
I never knew Grand has a carrier-locked variant... Given its target market in developing countries, not US.
Your best bet is to complain to your carrier and claim your warranty, because it seems like they have done lousy modifications to the phone...
An architecture student and likes anything tech.
Nokia N-Gage QD (2006) --> Nokia 2730 Classic (2010) --> Ivio DE88 (2011) --> Sony Xperia Go ST27i (2012) --> Samsung Galaxy Grand Duos i9082 (2013) --> (used) Sony Xperia V LT25i
Secondary device: white iPad 2 64GB, with jailbroken iOS7