HTC One M8 32GB Smartphone AT&T Wireless 4G LTE for all GSM Carriers - Glacial Silver 2G: GSM 850 / 900 / 1800 / 1900 3G: HSDPA 850 / 1900 / 2100 4G: LTE 700 / 850 / 1700 / 1800 / 1900 / 2100 / 2600 5" Super LCD3 Multi-Touchscreen w/ HTC Sense UI v6 and Protective Corning Gorilla Glass 3 Android v4.4.2 (KitKat), Quad-core 2.3 GHz Krait 400 Processor, Chipset: Qualcomm MSM8974AB Snapdragon 801 Dual 4 Megapixel Camera (2688x 1520 pixels) w/ Autofocus, Dual-LED Flash + Font-Facing 5 Megapixel Camera + Video Internal Memory: 32GB, 2GB RAM + microSD Slot Expandable up to 128GB 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.