... dual sim dual standby Apphone, Backcover of iphone 4 & 4s, supports two sim cards(WCDMA & GSM), GPRS, MMS with Large back up battery ... sim cards(WCDMA & GSM), GPRS, MMSLarge back up battery capacity, change iphone4 anytime anywhere Parameters:Network standard : GSM ... : black/white/balck mix whiteStandard configuration: APPhone, battery, User Guide with package Packaging specificationsPieces per carton: ...