You used to be able to use the ##4636## trick to get a hidden menu, but now that’s gone too. There’s nothing in the menu that alllows you to select which network to use. I hate to keep having network disconnects and in perpetual 4G/5G back and forth and battery draining.
I use Samsung btw
Edit: For context: Its due to issues with being near the edge of the 5G zone so your phone keeps going back and forth between 4G and 5G which (I suspect), is what causes constant network disconnection, phone being hot/warm, and battery drain. Very annoying.
I don’t know how to do this, and you probably should be able to even though I can’t see why you would want to, but why would you want to do this?
5G is flaky as hell, in my experience. When it works, it works great. But, it frequently disconnects and won’t reconnect.
Network issues. Constant switching back and forth is annoying, internet disconnect, phone gets hot, battery drain, etc.