HTC One M8 - Factory Unlocked 32GB - US Warranty (Gunmetal Grey) Display: 5.0-inches, Resolution: 1080 x 1920 pixels Camera: HTC UltraPixel - Camera: UltraPixel Camera with BSI sensor, f/2.0, 29mm, autofocus, dual-LED (dual tone) flash, Front camera: 5-megapixel, captures Full HD 1080p video Processor Speed: 2.3 GHz - OS: Android 4.4.2 (KitKat) Battery: Non-removable Li-Po 2600 mAh battery, Stand-by: Up to 271 h (2G) / Up to 496 h (3G), Talk time: Up to 14 h (2G) / Up to 20 h (3G) 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.