The Samsung Keystone 2 is simple, straightforward and ideal for basic phone use offering extra long standby time, FM radio and a large font size keypad. Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile; also compatible with GSM SIM cards like H20 and select prepaid carriers. Phone will not work with Sprint, Verizon, Boost Mobile, Virgin Wireless or other CDMA carriers. Please contact your carrier to confirm support of voice and data on this unlocked GSM device.