Wi-Fi calling
I have poor mobile coverage where I live. It used to be fine as we had Vodafone Suresignal but Vodafone have done away with it saying that Wi-Fi calling has taken over. Recently on my iPhone XS I am having problems. When the phone is lying idle it shows up Wi-Fi calling but when I lift it it disappears. We are not having this problem on any other iPhone in the house (different models). I have been on to Vodafone several times and reset network settings, and did everything they say but to no avail. It only seems to have happened since the most recent software update.
iPhone XS, iOS 16