Samsung i337 Root and Unlocked on z3x
Samsung i337 Android 4.3 Root on Kingo Root and Unlocked on z3x
here is the full info about unlock this AT&T carrier Samsung S4 i337
1. Root on Kingo Root.
2. Take QCN Backup before unlock if something happen wrong in process.
3. Direct unlock on Z3X tick on new security.