BLU Studio 5.5 D610a Unlocked Dual SIM GSM Phone (Pink) Unlocked Dual Sim 5.0-Inch FWVGA Display, 1.2 GHz Quad Core Processor Android 4.2 Jelly Bean, 4GB Internal Memory, 1 GB RAM Micro SD up to 64GB 5MP Camera and 0.3MP Front, HD Video Recording 720p, LED Flash Wi-Fi 802.11 b/g/n, Wi-Fi Direct, Wi-Fi hotspot; Bluetooth v4.0; 2250 mAh Battery 4G HSPA+ 21 Mbps 850/1900: Nationwide AT&T: Cricket Wireless, Straight Talk, Net10, H20 Wireless, 420 Wireless, Black Wireless, Consumer Cellular, Pure TalkUSA, Red Pocket, Telcel America. T-Mobile: MetroPCS, Lyca, Speedtalk, Go Smart, Simple Mobile, Net10, Straight Talk, Solavei, Ultra Mobile, Telcel Amrica, Walmart Family Mobile supported in most areas; check with your service provider. 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.