This 1 pack having 50 credits inside
Please Download Latest Shell and Samsung Pro to Use these credits from Developer Web.
Select Your model Click On Unlok There it will ask for Login Put Username And Password there and get device unlocked.
Each unlock code cost 5 credits.
Each T-Mobile/MetroPCS/ Unlock cost 10 credits(Credit depands on z3x team promotion offer)
after Successful order check your account/Product .