Comment by xzjis

Back in school, I had a teacher who was in charge of installing 3G, 4G, and 5G antennas for a carrier in France. The answer is that the 4G frequency bands are saturated, and they pushed 5G mainly to relieve congestion on the 4G network. Theoretically, 5G has just as much range (maybe even a little bit more with beamforming) on the 700 MHz and 800 MHz bands.