A single 6MHz channel at the top end of UHF band would be enough to implement a universal cellular telephony service - simple calls and texts - at very low cost if phones had modems for it. I think that would be the better use of spectrum.
rf 70+ is 800 Mhz
rf 52+ is 700 Mhz
rf 38+ is 600 Mhz
Lots of phones support these frequencies.
Kind of annoying for tv, because cell towers on frequencies that used to be tv frequencies can overload amplifiers, so peeps need to go put filters up before the preamp.