LG OPTIMUS G E975 32GB BLACK ANDROID FACTORY UNLOCKED LTE 4G 3G 2G (2G & 3G HSDPA 900/2100 & 4G LTE 800/900/1800/2100/2600 market dependent) 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.