SONY Xperia M2 D2303 8GB Black Factory Unlocked Single SIM LTE 4G 3G 2G Cell Phone 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.