Apple iPhone 4 8GB Unlocked- Black Apple iPhone 4 8GB Black GSM Factory Unlcoked iCloud enabled Instructions included Original Apple packaging 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.