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Jun 3, 2015 at 5:58 comment added tubedogg You're correct, my mistake. That said, it is likely the processing power of the 4s which precludes it from pairing with Apple Watch. The phone acts as a server for the device, doing all the heavy lifting for apps which send information to the watch's screen. Given that 4s apparently doesn't run iOS 8.x particularly well, I wouldn't imagine it has leftover processing capabilities to run the watch on top of that.
Jun 2, 2015 at 5:54 comment added jkasten Thanks for your answer, however on Bluetooth SIG's site I found that the iPhone 4s, iPad (Air, Mini, 3rd & 4th gen), and iPod touch (5th) are Bluetooth Smart Ready which means they are compatible with both standard and low energy Bluetooth protocols.
May 30, 2015 at 16:30 history answered tubedogg CC BY-SA 3.0