It had a SIM card. Or any other way to connect to the internet independently. I know it's not very Apple-like and would probably make the device thicker, but imagine if you could go for a run or take a quick trip to buy groceries and took only a watch, but were still able to receive messages, reply them using Siri, make calls, read mails and etc. That would be a whole lot different right? The way the Watch is now, whats the point in reading and e-mail in a tiny screen when your phone is inches away? PS: sorry for my english, I'm not a native speaker.