Samsung E2220 Black Keyboard Unlocked GSM QuadBand Bar Cell Phone 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.