BLU Dash 5.5-US GSM - Unlocked (Blue) 5.5 inch FWVGA Display (480x854): 5MP Autofocus Camera 2581x1936 pixels with LED Flash, HD recording (1080p), VGA Front Camera Unlocked Dual SIM Phone; 4GB Internal Storage 512 MB RAM with Micro SD Slot up to 64GB MediaTek Quad -core1.3 GHz processor with ARM MALI 400 GPU Android 4.2 Jelly Bean (Upgradeable to KK 4.4) GSM Quad Band 4G HSPA+ (850/1700/1900): US Compatibility Nationwide on all GSM Networks including AT&T, T-Mobile, Cricket, MetroPCS, Straight Talk, Pure Talk USA, and others 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, Pure Talk USA and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.