Calls going straight to Voicemail
iPhone13 iOS 18.1.1
Used to work fine, now no calls coming through. A different SIM that works in a different phone has the same problem when I put it in my phone, so it is not a network problem, it is a problem with my phone that I have only noticed recently since the last update. Have checked many settings including Focus, and have tried many suggestions (like not sharing with other devices). Help!
iPhone 13, iOS 18