I purchased the Samsung galaxy note 3, model N900W8, which was advertised as U.S. 4-G/LTE. When I placed my at&t sim card within this device, all I got was H+ and not 4-G or LTE. my sim card configures itself which I went on-line to google and put in an at&t 4g apn address and still get the H+. Was this 4g/lte model meant for someplace other than the united states. I live in Baltimore Maryland.