No option to turn on cellular calls

Both Devices on the Same Wifi Network. Bluetooth on on Both Devices, Same iCloud account signed in to iMessage and FaceTime.

i am connected to same wifi network and same iCloud account signed in to iMessage and FaceTime but STILL i don't find option to enable iPhone cellular calls on FaceTime preferences. i'm using mac air (late 2010) upgraded to Yosemite and iPhone 5s.

Somebody please HELP!!!

There is no such option in FaceTime. All you have to do is enter the phone number you want to call in the facetime window, and if your iPhone is on and connected to the same wifi network then it will be found and used if the entered number cannot be connected to via facetime.

There is however a catch. There is no numeric keypad available in facetime (not what I have found at least). This means that you for example cannot use this to call Apple Care support. Since it is impossible to enter the "menu" selection (press one for ...).

If this feature works also depends a lot on the network connected to. On my hone network it works fine. At work it actually finds my phone (ren banner on top for a short time), but then fail to make the call.

Don't forget to login iCloud on your Mac. That's mean you need to login Mac iCloud, facetime, iphone iCloud, facetime with same account.

I have experienced issues relating to the continuity feature that allows one to make cellular calls from an iPad or Macbook. Basically I was no longer able to make/receive iPhone calls from my iPad or Macbook. There is usually an option in settings/facetime on my iPhone 6 running iOS8.2 for iPhone cellular calls. This needs to be switched on. There is usually also an option on my late 2013 high spec Macbook running Yosemite (in FaceTime preferences) for the same thing - this also needs to be switched on. These iPhone cellular options totally disappeared from the menu systems when I was playing around with 2 step verification and signing in and out of FaceTime etc. My devices were definitely on the same wifi network. I phoned Applecare who suggested a couple of options though were unable to resolve the problem, they suggested it was a Carrier issue which it certainly was not. Applecare made an appointment for me at my local Apple Store. Basically the cellular options re-appeared on my Mac and iPad after switching off 2 step authentication, logging out of Facetime, iMessages and iCloud on ALL devices and logging back into all using my basic apple ID. I have no idea whether all of that was necessary, but it worked. I am now in the process of returning to 2 step verification. Hopefully it will continue to work....

I can now make/receive cellular calls from my Macbook and iPad.

I also learnt that the iPhone and Macbook are not designed to link to each other via Bluetooth. I had thought there may have been some hardware issue when mine would not connect - apparently not.

I have the same question. I enabled Calls using iPhone more than 4 month ago and until yesterday I was making and receiving calls fine. Today I don't know what happens but calls doesn't works !! .. I tried to configure again but the mentioned tick box is not on the FaceTime menu as you see in the pic. I have Yosemite OS X 10.10 in Mac and iOS 9.1 in my iPhone .. can both buttons disappears just like that ?? The article in C|Net shows the mentioned button with the yellow arrow. The dialer says consistently the number IS UNAVAILABLE .. since today !! Yesterday was all working nice !! Mac and iPhone are om the same net.