BLU Studio 5.5k D710 Unlocked GSM Dual-SIM Android Cell Phone - Black 2G: GSM 850 / 900 / 1800 / 1900 (SIM 1 & SIM 2) 5.5-inch TFT Capacitive Multi-Touchscreen Android v4.4 KitKat (upgradable), Dual-Core 1.3 GHz Cortex-A7 Processor, Chipset: Mediatek MT6589, PowerVR SGX544 Graphics 3.2 Megapixel Camera (2048 x 1536 pixels) w/ Autofocus, LED Flash + Front-Facing VGA Camera + Video Internal Memory: 4GB ROM, 512MB 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.