Display: 4.7-inches * Camera: HTC UltraPixel * Processor Speed: 1.7 GHz * OS: Android 4.2 (Jelly Bean) * Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20 and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.