BLU Star 4.5 Design Edition Global GSM - Unlocked (Blue) 4.5" IPS LCD Capacitive Multi-Touchscreen MediaTek Quad-Core 1.3 GHz Processor Android 4.4 (Upgradeable to v5.0), , Mali-400 Graphics 5 Megapixel Camera (2592 x 1944 pixels) w/ Autofocus, LED Flash + Front-Facing VGA Megapixel Camera Internal Memory: 4GB ROM, 512 MB RAM + micro SD Slot Expandable up to 32GB GSM Quad Band 4G HSPA+ (850/1700/1900) 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, Pure Talk USA