When iOS 9 is released this fall you'll be able to answer phone calls on your iPad or Mac even if you left your iPhone at home. Continuity, the feature that currently lets you make and answer calls from most of your Apple devices on the same network, will add the ability to do the same over a cellular connection, and that means forgetting your iPhone when you go to the coffee shop won't lead to missed calls.
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Most people carry their iPhone everywhere they go, but Continuity over cellular will still be a big deal because it means you'll have your mobile-based communication hub available all the time instead of only when all your devices are on the same network.