Can't make and receive calls on my Mac

The "iPhone Not Available" error on your Mac indicates a Continuity (Handoff) issue preventing calls via FaceTime, even after standard troubleshooting.[idownloadblog]​

Verify FaceTime Settings on Mac

In FaceTime > Settings, ensure "Calls from iPhone" is enabled. Select your iPhone number (not just email) under "You can be reached for FaceTime at," and set FaceTime as the default for calls.

Adjust iPhone Settings

On iPhone, go to Settings > Phone > Calls on Other Devices: Toggle it on and explicitly select your Mac. Also check Settings > FaceTime to confirm your phone number is active.

Additional Quick Fixes

Keep FaceTime open on Mac (it must run in background). Reset iPhone network settings (Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings), ensure same Wi-Fi, and test devices close together. If unresolved, contact Apple Support or your carrier for SIM/Carrier checks.

I was facing the same problem and nothing worked but changing one setting finally did the trick for me.

On your iPhone, go to Settings and select FaceTime. Under FaceTime, there should be an option called "Default Calling App." Under this option, select FaceTime Audio, and this should solve the problem.

All my settings are below:

On iPhone:

1. In Phone App Default Calling App is FaceTime Audio, Calls on Other Devices option is When Nearby (Under which I have toggled on my MacBook)
2. In "FaceTime App" again Default Calling App is FaceTime Audio. Under you can be reached by FaceTime at I have selected both my mobile numbers as well as both email id. Under Caller ID I have selected one mobile number which is my primary mobile number.
3. Wi-Fi Calling in Phone App is turned on for both numbers.
4. FaceTime App is logged in with my Apple ID.

On Mac:

1. Under You can be reached for FaceTime at, I have again selected the same as phone, both mobile numbers and mail id's.
2. Calls from iPhone is selected.
3. Under Start new calls from, I have selected my primary mobile number which is same as in Phone App.
4. FaceTime App is logged in with my same Apple ID as my Phone.
5. In the Phone App on Mac, Apple Account is logged in with the same Apple ID. Start new calls from is the same primary number, and Calls from iPhone is selected.

just tried that, did not work.

I have all of the settings mentioned above, still doesn't work.... :-(

Making calls from my Mac had worked for a good few years but when I tried calling a contact a few days ago it would not. Don't know the reason but the above solution worked for me, Thank you