I had just purchased the iPhone XS and unlike my iPhone 7, the XS can pick up Band 66, Now I had my Network extender switched from band 13 to 4 because that's what my area had. Now the XS can pick up Band 66 and the phone prefers that that. I requested the Network extender be switched to band 66. After 2 weeks of calling level 3 network support text me and said that wasn't possible and forbidden by the FCC. I know for a fact the extender is capable for broadcasting 66 , however, the tech refused to help me and said I have no other options. Right now, the only way to connect to the Extender is to turn off and on the Phone's LTE every time i come home which is not acceptable. The tech was EXTREMELY rude and argumentative. Does anyone have any suggestions as to any recourse i may have?