Recently has someone who could not recieve or make phonecalls on their iphone , went through the troubleshooting steps :
We swapped the sim to another phone and worked no issues. Swapping to another iPhone and restoring Backup , brought the same issue which means it must of been a setting
- Turned Bluetooth off ( Incase Connecting to car )
- Dial : *#31# ( to remove no caller ID )
- Do not disturb- off
- Airplane mode off
- Call forwarding – off
In the end this resolved the issue :
Go to Settings > Mobile> Mobile Data Options > Enable 4G ( or LTE ) for Voice AND Data
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