Ackchyually; most communications are over O[tic Fibre, even 5G!
POTS, Cellular base stations PABX units oh, the answer you've been waiting for, short hop microwave links. They're usually under 1W though. The days of long haul microwave links are long gone! Only used in rural areas because of the "rain fade" problem. Doesn't happen with optic fibre which is more reliable has a higher bandwidth and can't have interference.