Hello and welcome to Apple Support Communities, JasonA70!
We understand you're having trouble getting phone calls on your MacBook Air. We'd be happy to provide information to help you address this.
Make sure your iPhone has the setting enabled to allow the MacBook Air:
Allow phone calls on your iPad, iPod touch, and Mac
"Allow phone calls on your other devices from iPhone
- On your iPhone, go to Settings
> Cellular. - If your iPhone has Dual SIM, choose a line (below Cellular Plans).
- Do any of the following:
- Tap Calls on Other Devices, turn on Allow Calls on Other Devices, then choose the devices on which you’d like to make and receive calls.
- Tap Wi-Fi Calling, then turn on Add Wi-Fi Calling For Other Devices.
- This allows other devices where you’re signed in with the same Apple ID to make and receive calls even when your iPhone isn’t nearby.
- On your other devices, set up FaceTime and sign in with the same Apple ID that you use on your iPhone.
- Turn on Wi-Fi calling:
- On your iPad or iPod touch: Go to Settings > FaceTime, then turn on FaceTime and Calls from iPhone. If you’re asked, turn on Wi-Fi calling.
- On your Mac: Open FaceTime, then choose FaceTime > Preferences > Settings. Select “Calls from iPhone.” If an Upgrade to Wi-Fi Calling button appears, click it, then follow the instructions.
Note: If you enable Wi-Fi Calling, emergency calls may be made over Wi-Fi, and your device’s location information may be used for emergency calls to aid response efforts, regardless of whether you enable Location Services. Some carriers may use the address you registered with the carrier when signing up for Wi-Fi Calling as your location."
Let us know the results.
Have a great day!