Apple released the iOS8 and OS X 10.10 Two new systems in 2014, one for IOS devices and one for MAC computers. Adding interactivity to the two new systems allows IOS to interoperate with MAC devices, such as the one you're talking about today. Here is a brief introduction to the MAC on the phone call failed solution, hope can help you.
1, first of all, to use your Mac phone, you need to install the current OS X 10.10 system on the Mac, and your iPhone will be updated to the latest iOS8 system.
2. When we have the latest system on both the iphone and the Mac, then we need to log on to the ICloud service separately on the iphone and Mac. As shown in the following illustration, you can log in with the Apple ID on the IPhone in "set-icloud" .
3, then also need to use our Apple ID to turn on the FaceTime function on the iphone "set-facetime" , and also need to open the "iphone cellular mobile network call" option on the iphone, it is a necessary condition for the iPhone to be combined with the MAC.
4, after the IPhone is ready, then we also need to use the same Apple ID on the Mac login, as well, in the " System Preferences-icloud" can be logged in.
5, then on the MAC also need to use the Apple ID to login, and the same to open the "iPhone Cellular mobile network Call" this option.
6, when the above conditions are met, then you can complete the phone on the MAC function. If one of the items is not set correctly, calling on the Mac will fail. Of course, these are some of the basic features of the phone on the Mac, and continue to introduce some of the other issues below.
7, first of all, say the most common one, when the phone call on the Mac prompted US "IPhone and Mac must be in the same wireless network" , as shown in the picture
8, when you encounter this situation, please check your Mac and IPhone are connected to the same network. This type of problem may not be encountered at home or in the office, but it is possible to encounter such problems if you are using other networks outside.
9. These are some of the day-to-day solutions to the failure to call on a Mac, and there may be other problems in real life.