BLU Studio 5.0k - Unlocked (Blue) Unlocked Dual SIM 5.0" High Resolution FWVGA Display, Dual Core 1.3 GHz Processor GSM-GPRS-EDGE 2G 850/900/1800/2100 3.2MP Camera, Android 4.2 Jelly Bean, Upgradable to Kit Kat, 4GB Internal Storage, 512MB RAM 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.