Check your iPhone settings
Go to Settings and turn on Airplane Mode, wait five seconds, then turn it off. Check Do Not Disturb. Go to Settings > Focus > Do Not Disturb and make sure it's turned off. Check for any blocked phone numbers.
If you can't make or receive calls on your iPhone - Apple Support
Can't send or receive message then try these steps first
- Restart your device: ...
- Check your network connection. ...
- Check with your carrier to see if the type of message you're trying to send, like MMS or SMS, is supported.
- If you're trying to send group MMS messages on an iPhone, go to Settings > Messages and turn on MMS Messaging.
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If you can't send or receive messages on your iPhone, iPad, or ...