I can’t make calls or text messages
How I can fix the problem
I can’t make call or receive
iPhone X, iOS 15
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See these Apple articles below:
If you can't make or receive calls on your iPhone
https://support.apple.com/en-us/HT204027
If you can't send or receive messages on your iPhone, iPad, or iPod touch
If you can't send or receive messages on your iPhone, iPad, or iPod touch - Apple Support