Motorola EX223 Unlocked GSM Phone with Dual SIM, Touchscreen, QWERTY Keyboard, 3 Cellular Band - Quad-Band 850 / 900 / 1800 / 1900 Mhz 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.