My Tesla Model 3 supports Band 14, but that's only because I use an AT&T Hotspot and connect to that via WiFi. Actually I use a Verizon Hotspot as well for when I'm in areas not covered well with AT&T. (I combine both hotspots using software called Speedify on my laptop to have a stable connection for work when traveling). Like with anything such as supplemental power it's best to use a portable battery bank, supplemental internet use a Hotspot or two or three or four, for music stream using your own phone as you'll get a better selection and better quality than the built in streaming. About the only thing I use from Tesla is their mapping software, and it's great but not perfect, so sometimes abetterrouteplanner or Waze has to supplement.
