HTC One M7  Factory Unlocked Cellphone, 32GB, Silver Display: 4.7-inches Camera: HTC UltraPixel Processor Speed: 1.7 GHz OS: Android 4.2 (Jelly Bean) 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, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.US Warranty.