Could you please tell me if this phone will work in the USA? I currently have Straight Talk which uses AT&T towers. I need to know if it will work with an AT&T 4G LTE sim card. I contacted Straight Talk and this was there answer. "It will work as long as it is an AT&T or T-Mobile compatible or an unlocked domestic GSM phone." Thank you very much for your time. Reply:Thank you,this phone work in US 100%,also work at AT&T and T-mobile,phone is unlocked worldwide,thanks...