Putting aside the confusion in this thread between 2GHz and 5GHz wifi and 4G and 5G cellular, it's worth noting that not all 5G is created equal and much of the recent hoopla about 5G won't provide the performance improvement that many people are expecting.
All three carriers are now using DSS (Dynamic Spectrum Sharing) to insert a form of 5G onto their existing 4G networks. This saves enormous costs (for them) and speeds up the process of being able to claim that they have 5G nearly everywhere.
However, the drawback to using frequencies in the 600-800MHz band for 5G is that the result is a sort of "5G Lite" with speeds that are somewhat better than what most of us get with 4G but not blazingly fast! "Real 5G" requires millimeter wave technology which might never be seen anywhere outside major urban centers. Over time there will be a build-out of mid-band 5G in the 2.5GHz region which will produce an "in between" form of 5G.
