New iwatch

When you’re ready to start using a new Apple Watch, you can transfer cellular service from your old watch to your new one. Here’s how:

1. Remove the cellular plan from your old Apple Watch. You can do this from the Apple Watch app or by erasing your old Apple Watch. 
2. Pair your new Apple Watch with your iPhone. During setup, tap “Set up Cellular” to add a cellular plan.
3. Some carriers allow you to transfer your existing plan to your new Apple Watch directly from the Apple Watch app. 
4. If you don’t see an option to transfer your cellular plan, contact your carrier for help.