Unlocked 5.5 Inch 960x540 Screen With MTK6582 1.3GHz Quad Core CPU Android 4.4 Smart Phone 1GB RAM, 8GB ROM+GPS+S Pen air gesture-BLACK Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.