Continuity

Features—such as Handoff, Instant Hotspot, phone calling, and SMS—that let you seamlessly move between your iPhone, iPad, iPod touch, and Mac, or use them together. For example, with Handoff you can start a document, email, or message on one device and pick up where you left off on another device.

To use Continuity features, your devices must meet system requirements. See the Apple Support article System requirements for Continuity on Mac, iPhone, iPad, iPod touch, and Apple Watch.