Enable Verizon 5G on Note 20 Ultra

Using the Google Phone app (not the built in Samsung dialer), dial: *#*#27663368378#*#*

This will bring up a hidden menu. It's a very finniky app and you have to use the Back option within the app's top-right, tripledot menu to navigate (don't use the Android back button).

Once you are in, use the following menu options to enable 5G:

Step 1: Option 2, 1, 2, 9, 9, 9, 9, 1, 1 -> Set Default LTE Band
Step 2: Option 2, 1, 1, 1, 9, 9, 2 -> NR DSS Enable
Step 3: Option 2, 1, 1, 9, 3 -> NR5G PRUNE is removed

Reboot and you should have 5g.

Step 1 enables all LTE bands which is needed to get 5G working.  Step 2 enables Dynamic Spectrum Sharing which allows 5G and 4G LTE to co-exist on the same spectrum.  Step 3 enables all 5G bands.