iPhone Calls From Your MacBook
Now you can make iPhone calls from your MacBook, even when your iPhone is not in your hand. You can also both send and receive iMessage and all SMS text messages on your Mac, or MacBook too. Apple calls this continuity. Read more at Apple's website.
You can make a phone call from your MacBook, or iMac, and it is easy. You just click on any phone number you see in your Contacts, your Calendar, your Messages, in Spotlight, or even Safari. You can also just enter the phone number on your MacBook and dial away. Easy as pie.
Apple's Continuity Information