Samsung Ativ Odyssey I930 8GB Unlocked GSM Windows 8 Smartphone - Black CDMA 800 / 1900 + GSM 850 / 900 / 1800 / 1900, 3G: CDMA2000 1xEV-DO + HSDPA 2100, 4G: LTE 700 MHz Class 13 4" Super AMOLED Capacitive Multi-Touchscreen Microsoft Windows Phone 8, Dual-Core 1.5 GHz Krait Processor, Chipset: Qualcomm MSM896 Snapdragon, Adreno 225 Graphics 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED Flash + Front-Facing 1.2 Megapixel Camera + Video Internal Memory: 8GB storage, 1GB RAM + microSD Slot Expandable up to 64GB 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.