Fairphone

It did, but this is just network type. I meant specific frequency bands.

For example (4G, my phone doesn't do 5G), indoors I may get automatically placed into Band 20 (800MHz) with less bandwidth and more load. This was especially a problem when I tried O2. During the day, I'd see around 3Mbps in this band, which was what I'd get indoors. Manually I could switch it to B3 to get the max limit of 20Mbps for the cheap plan I was trying.

Another example would be Telekom. When in a train or car, I get placed into B20 usually. In this case I get some 25Mbps, so it's fine. BUT, in certain cities they have B7 where they run 20+20MHz LTE-A, and that usually gets me 130 - 150Mbps. Pretty damn big difference.

Oh, also not all settings in the selection you posted are valid. I think they're just what's in Android. My phone also lists "NR" for example, despite not supporting it.
Other than this menu, the same thing is controlled in Settings under "Preferred network type". Although this still gives more control.

Fun fact: Disable 2G option was only available since it seems Android 12, but via this hidden menu has been available for... probably all the time.
Effectively the same setting on my Android 2.3.6 phone: