Samsung GT-E2222 Unlocked Cellphone - US Warranty - Black 2.2-Inch TFT-LCD Display QWERTY Dual SIM FM Radio/ FM Recording MP4/MP3 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.