BLU T190i Tank Quad-Band GSM Phone with 1800 mAh Battery, Camera and Bluetooth - US Warranty GSM Quad band, Unlocked Dual Sim 850/900/1800/1900 30 Days Standby-By Battery, 16 Hour Talk Time 1.8" LCD Display, Camera, Bluetooth, Facebook, Twitter Built-in FM Antenna, MP3 Player, MP4 Player 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.