* Unlocked cell phones are compatible with GSM carriers, including AT&T and T-Mobile; also compatible with GSM SIM cards, including H20 and NET10. * Phone will not work with Sprint, Verizon, Boost Mobile, Virgin Mobile or any other CDMA carriers. it only support straight talk with AT&T or T-mobile tower sim .It dont support straight talk with verizon or sprint as they are CDMA networking . So please confirm If it use att or t-moible tower for the straight talk at your area . * Please make sure you have a sim card . DONT SUPPORT CDMA NETWORK AND 4G NETWORK SIM CARD . .