The GP may well only have 4G/LTE available, not the faster 5G/fixed wireless. In our neighborhood, the 5G/fixed wireless stuff is not yet available from T-Mobile or Verizon, only 4G/LTE.

And either way, even that coverage is spotty and speed varies highly on the time of day that you're trying to use it.

All this is fine for a tertiary backup solution (behind Starlink) but not as a primary method of accessing the Internet.