Hi ​@Tony Cobb, 

I'm sorry to hear you're unable to make calls.

Please try the following network reset steps for your device:

For iPhone

1. Go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.
2. Enter your passcode if prompted and confirm the reset.
3. Your iPhone will restart automatically.
4. Once it has restarted, try making a call again.

For Android

1. Go to Settings > General Management > Reset > Reset Mobile Network Settings.
2. Confirm the reset.
3. Restart your phone if it doesn't restart automatically.
4. Once your phone has restarted, try making a call again.

If you're still unable to make calls after completing these steps, please let us know the make and model of your phone, along with any error message you receive when attempting to call.

Thanks, 

Anneline