You can now have a big unwieldy phone. When you run around, you use your watch's small screen. When you get home, or on a train, or in a café, you can pull out

You can now have a big unwieldy phone. When you run around, you use your watch's small screen. When you get home, or on a train, or in a café, you can pull out your giant tablet-phone and watch HD content on it.