Unable to make calls post updating my iPhone 13 to iOS 18.

Hello, after update I’m having problem with calls, I can’t call anyone, also via FaceTime and Instagram, because I’m getting “Call Failed” message.

It all started after iOS 18 update. It’s happening everywhere, in Prague but also in France.

I also had call from AppleCare support manager and she can’t help too.

From carrier’s side is everything good.

I sent the phone for warranty repair.

Now I’m using iPhone 7 and I don’t have the problems.

Anyone have this problem too?

[Re-Titled By Moderator]