The iPhone, iPad, and Mac are all different devices with different interfaces, but they can and should provide a seamless way for people to move between them and use them together. That's the idea Continuity is built on. There's Instant Hotspot for sharing cellular connections, AirDrop for transferring files, relay for sending and receiving SMS/MMS, and making or taking phone calls, all from your iPhone, all on your iPad or Mac, and Handoff for continuing your activities even when you switch devices.
Although these features are all grouped under the same name, they all have different requirements and all work in different ways. Luckily, they're also easy to set up and easy to use once you know how!
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