The only available booster that does amplify band 71 is the WilsonPro 710i , which is designed for commercial buildings and large homes. It requires preapproval from T-Mobile to operate on their network. Other 4G/5G boosters do support T-Mobile band 12 (700 MHz), band 2 (1900 MHz), and bands 4 and 66 (1700/2100 MHz).