iPhone 7 Pairing issues
Shortly after the release of the iPhone 7, we discovered it caused a connection problem for our new Pebble 2s.
We've since worked with Apple to resolve the issue, and a fix was included in their most recent update.
Please make sure your iPhone's updated to iOS 10.1, then go to your phone's Settings, tap 'Bluetooth' and tap on and forget any Pebble devices.
Then, just start from the beginning to set up your watch.