My number is not connected to the phone and I can receive calls or make calls
How can I make outgoing calls/texts and receive incoming calls/texts on new device? It's not working
iPhone 13 Pro Max, iOS 15
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With the phone on, take out the SIM card and put it back.
see also
Go through the various suggestions in the support article below but if they don't help, and your network carrier can't help, then contact Apple Support for further investigation.
Support article: