on 14-12-2023 11:46
Since updating to ios 17.1.2 & now on ios 17.2 it is hit and miss to be able to make & receive calls. Currently i am not able to do so.
on 14-12-2023 11:56
If you believe it's due to the update, contact Apple https://www.apple.com/uk/retail/geniusbar/
Otherwise, check for network issues Guide: How can I sort out my network issues?