The Apple Watch

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Yes, you can use Apple Pay with the Apple Watch. Great addition, no more digging in my pocket for my iPhone Plus (if I can actually get it out of my pocket).

Does it come with a kill-switch ?

The main innovation I like is NFC in the Watch. This makes so much sense. What is the big advantage of pulling a phone from your bag instead of a wallet? Paying with a wrist, opening doors with your wrist, entering the metro with your wrist. Can't wait for the next Wear releases from Samsung to have it integrated :)