I have 3 phones and after Dec update 4G Only is not working at all. Carriers list: A1 (Austria), Etisalat (UAE), Du (UAE), Orange SK (Slovakia), T-Mobile (DE) and Vodafone (CZ). I been in this countries in last week and had time to test. Phone is just not registering in networks.
It ALWAYS starts from 3G or H+ and after a while (20s up to 8 minutes) it connecting to 4G. <- When I select 4G or 5G setting not 4G Only.
Why? And why you removed region select from ##4636##?
@GrapheneOS