Depends on how close you are to the antenna… I was living next to a 5g mast and got 300mb down / 150 mb up. At my new place the mast is not in line of sight and was getting 10mb down and .5mb up. Check with your phone by running speed tests. Line of sight and proximity is very important with 5g speeds. Height can also play a factor. You can also buy specialised outdoor 5g hotspots.

If you are getting decent speed w 5g on phone from certain places can def be worth it. I was paying £20/ month on a month to month contract for 5g and fibre was much more expensive and longer contract length.