After having latest upgrade on my Zenfone 9 my phone started to get less coverage. I cross checked with my old phone. It gets service properly (both mobile and internet) my Zenfone gets only mobile coverage from time to time but no internet at all. Sometimes it acts like it has edge but still from the exact spot with using my 4 years old old phone i can get LTE internet coverage.
I tried SIM Signal test, it is good. I checked every setting including Enabling 2g but it did not get fixed.
I am located in Poland and using T-Mobile as provider.