HTC Windows Phone 8X Blue 16GB - Unlocked GSM 850 / 900 / 1800 / 1900, 3G Network: HSDPA 850 / 1900 / 2100, 4G: LTE 700 MHz Class 17 / 850 / 1700 / 1900 / 2100 4.3" S-LCD2 Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass 2 Dual-Core 1.5 GHz Krait Processor, Chipset: Qualcomm MSM896 Snapdragon, Adreno 225 Graphics 8 Megapixel Camera (3264 x 2448 pixels) ) w/ Autofocus, LED Flash+ Front-Facing 2.1Megapixel Camera, 1080p video + Video 1080p@30fps Internal Memory: 16GB storage, 1GB RAM 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.