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 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 Messages.
Learn more. See Set up iPhone to get SMS texts on Mac in the Messages User Guide.