Additionally an iPad iPhone running iOS 10.x or a Mac running MacOS 10.12 can be configured to make and receive calls on your cellular number through an internet connection. Even though the call does not go directly through the telco cellular network, the minutes, texts, and data count against the cellular account.
This is a very cool feature that I use. Just for future reference, the set-up will work with MacOS 10.10 or later with iOS 9 or later, if memory serves me correctly. I know I have been using it prior to Sierra.
