When you launch the app, you'll get to choose who you want to talk to. Apple Watch will suggest people you frequently communicate with, and you'll send them a one-time request. You can chat with a friend this way all over the world, not just locally -- there'll be a beep and a little haptic buzz before they hear your voice. Just like in the little video Apple showed, sleepovers and secret midnight communications are coming to your wrist.

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