The Apple Watch needs to be paired with an iPhone to perform most tasks. To pair your Apple Watch you will need an iPhone 5 or later running iOS 8.2 or later. You can only pair one Apple Watch to an iPhone at a time. If all these requirements are met and you're still having trouble pairing your iPhone to your Apple Watch try these troubleshooting tips:
1. Go to Settings > Bluetooth on your iPhone and make sure Bluetooth is on.
2. Make sure your iPhone is connected to Wi-Fi or a cellular network.
To pair your Apple Watch manually tap Pair Apple Watch Manually. Tap the info icon on your Apple Watch and locate your device's name. Locate your device's name on your iPhone and a six-digit code will appear on your Apple Watch. Enter the code on your iPhone. Now you can set up your Apple Watch by entering your Apple ID password and selecting a 4 digit passcode.