BlackBerry 8220 Flip Pearl Unlocked Phone with GPRS, EDGE and 2 MP Camera--U.S. Version with 60 Day Warranty (Black) 2.6 Inch LCD display 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.