Hey Reenie618,
It looks like you're coming from the article: Make a call with Wi-Fi Calling - Apple Support
"If Wi-Fi Calling isn't working
If you can't turn on or use Wi-Fi Calling, make sure that your carrier offers Wi-Fi Calling and that your devices have the latest software.
If you're unable to turn on or use Wi-Fi Calling, your device software is up to date, and your carrier supports Wi-Fi Calling, contact your carrier.
If you contacted your carrier and can't turn on Wi-Fi Calling or make a Wi-Fi call, follow these steps. Wait two minutes before you go from one step to the next.
- Go to Settings > Phone > Wi-Fi Calling and make sure that Wi-Fi Calling is on.
- Restart your iPhone.
- Connect to a different Wi-Fi network. Not all Wi-Fi networks work with Wi-Fi Calling.
- Turn Wi-Fi Calling off and then on again.
- Go to Settings > General > Transfer or Reset iPhone > Reset.
- Tap Reset Network Settings."
Those would be the best steps to take to attempt to resolve the issue.
If the problem continues after that, we'd recommend contacting Apple Support for further assistance here: Get Support
Thanks!