BLU Studio 5.0 K Smartphone - Unlocked - White 2G EDGE 850/900/1800/2100 5.0 inch High Resolution FWVGA Display 3.2 MP, VGA Front Camera, LED Flash 1.3 GHz Dual-core Processor, Android V4.4 Kit Kat 3.5mm Audio Jack, FM Radio, 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.