I have a pixel 6 on Google Fi. The cell coverage at my new home is not great. If I have my preferred network type set to 5G I have no Internet connectivity. If I manually change it to LTE I get connectivity (albeit slow).
Shouldn’t the phone try this on its own? If not, is there a legitimate app that will do this for me transparently and effectively?
The phone should do this by itself. Other brands of phones do. I don’t have that model to check, but sometimes there is an auto or preferred setting that will encourage it to do that. May require you doing some research.