BLU Studio 5.0 S II D572a Unlocked GSM Quad-Core Android Phone - Retail Packaging - Yellow 5.0 inches IPS Display: (540x960)8MP Camera with LED Flash with HD recording (1080p), 1.6MP Front Camera 4GB Internal Storage with Micro SD Slot up to32GB Unlocked Dual SIM Phone; 3G HSPA+ up to 21 Mbps 850/1900 1.3 GHz Quad Core Processor Android 4.2 Jelly Bean 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.