OS X 10.11.1 and FaceTime 3.0 --- I can not select " IPhone cellular call "

Make sure you've followed the instructions in this support article. Note that both iCloud and FaceTime on the Mac must be signed in to the same Apple ID; those are two separate steps. Also note that the Mac and the phone must be connected to the same Wi-Fi network. Ethernet won't work. Trying to pair the phone to the Mac as a Bluetooth device won't work either.

No Continuity feature will work if either of the devices is connected to a VPN.

If cellular calling still doesn't work, sign out of FaceTime and sign back in. You may have to do the same on the phone. The email address that you use as your Apple ID must be able to receive FaceTime calls.

I have not been able to get more than two devices, including other iOS devices, to be recognized as calling clients by an iPhone running iOS 9. I don't know of any documentation of that limit, but it seems to exist. If you have more than two clients, and some of them are intermittently reporting that the phone is not set up to allow calls, try reducing the total number of clients to one or two.

Please read this whole message before doing anything.

This procedure is a test, not a solution. Don’t be disappointed when you find that nothing has changed after you complete it.

Step 1

The purpose of this step is to determine whether the problem is localized to your user account.

Enable guest logins* and log in as Guest. Don't use the Safari-only “Guest User” login created by “Find My Mac.”

While logged in as Guest, you won’t have access to any of your documents or settings. Applications will behave as if you were running them for the first time. Don’t be alarmed by this behavior; it’s normal. If you need any passwords or other personal data in order to complete the test, memorize, print, or write them down before you begin.

Test while logged in as Guest. You'll have to sign in to iCloud with your usual Apple ID. Same problem?

After testing, log out of the guest account and, in your own account, disable it if you wish. Any files you created in the guest account will be deleted automatically when you log out of it.

*Note: If you’ve activated “Find My Mac” or FileVault, then you can’t enable the Guest account. The “Guest User” login created by “Find My Mac” is not the same. Create a new account in which to test, and delete it, including its home folder, after testing.

Step 2

The purpose of this step is to determine whether the problem is caused by third-party system modifications that load automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Please take this step regardless of the results of Step 1.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.

Note: If FileVault is enabled in OS X 10.9 or earlier, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of Steps 1 and 2.