Phone calls and text messages on your Mac
With a Wi-Fi connection, you can take calls—and make them—right from your Mac mini. (Requires an external microphone. Accessories are sold separately at apple.com, your local Apple Store, or other resellers.) You can also receive and send text messages.
Set up FaceTime for phone calls. On your iPhone (iOS 9 or later), go to Settings > Phone and enable Wi-Fi calling. Then, on your Mac, open FaceTime. Go to Settings, choose General, then click “Calls from iPhone.” See Set up your iPhone and FaceTime on Mac for phone calls in the FaceTime User Guide.
Make a call. Open FaceTime on your Mac and click Create Link or New FaceTime. Create Link will generate a link that you can share using AirDrop, Mail, Messages, Notes, or Reminders. New FaceTime allows you to enter a name, email, or phone number. You can also start a FaceTime call in Contacts. Click the phone icon 
in the FaceTime row for a contact. You can also click a phone number in a Spotlight search or in an app such as Safari or Calendar (your iPhone or iPad with a cellular connection must be nearby). See Make and receive phone calls in FaceTime in the FaceTime User Guide.
Take a call. When someone calls your iPhone, click the notification that appears on your Mac mini screen. Your Mac mini becomes a speakerphone if you’re not wearing headphones.
Tip: To temporarily turn off notifications about phone calls, messages, and more on your Mac, turn on the Do Not Disturb feature. Click the Control Center icon 
in the menu bar, then click Focus and choose a time limit.
Send and receive messages. Use Messages to send text messages from your Mac mini. All messages appear on your Mac mini, iPhone, iPad, iPod touch, and Apple Watch, so when someone texts you, you can respond with whichever device is closest. (Voice messages require an external microphone. Accessories are sold separately at apple.com, your local Apple Store, other resellers.) See Messages.
Learn more. See Set up iPhone to get SMS texts on Mac in the Messages User Guide.