Turn on your Apple Watch by pressing and holding the side button
Bring your iPhone close to the Apple Watch
Make sure Bluetooth is turned on your iPhone
Make sure your iPhone is connected to Wi-Fi or cellular data
Open the Apple Watch app on your iPhone
Tap Start Pairing
Hold your iPhone over the animation on the Apple Watch
Wait for the pairing process to complete
Follow the on-screen instructions on your iPhone and Apple Watch
Sign in with your Apple ID if prompted
Choose whether to restore from a backup or set up as new
Select your settings and preferences
Wait for sync to finish
Keep both devices close until setup is complete