Incoming calls
Several of my friends tell me that when they call my number or send me a message it says not deliverable what is the phone number is not accepting calls. What’s going on with that?
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See these Apple articles below:
If you can't make or receive calls on your iPhone
If you can't make or receive calls on your iPhone - Apple Support
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
Manually update your carrier settings on your iPhone or iPad
Manually update your carrier settings on your iPhone or iPad - Apple Support
Update your network provider settings manually on your iPhone or iPad
Update your network provider settings manually on your iPhone or iPad – Apple Support (UK)
You sure need to contact your Carrier.