I’ve recently returned from USA, and whilst out there couldn’t receive any calls to my UK number. When someone tried to call, they would get the message “Unable to connect your call”. Fortunately I had an Airalo data sim, so could still use imessage etc.
Went into the Apple store and they checked my phone settings and said everything looked fine, but couldn’t understand why it wouldn’t work.
Has anyone else had this issue? How do I resolve when going back?