Samsung SGH-T989 Galaxy S II 16GB White Android Phone - T-Mobile 2G: GSM 850 / 900 / 1800 / 1900, 3G: HSDPA 850 / 1700 / 1900 / 2100 4.5" Super AMOLED Plus Capacitive Multi-Touchscreen w/ Protective Corning Gorilla Glass Android v2.3.5 Gingerbread (upgradable), Dual-Core 1.5 GHz Scorpion Processor, Chipset: Qualcomm APQ86 Snapdragon, Adreno 220 Graphics 8 Megapixel Camera (3264 x 2448 pixels) w/ Autofocus & LED Flash + Front-Facing 2 Megapixel Camera Internal Memory: 16GB, 1GB RAM + microSD Slot Expandable up to 32GB 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.