I haven't been able to sync the cellular plan of the apple watch with my iPhone

Hi kenneychiu168, we want to help you with the error you are receiving while syncing your watch.

The specific error message that you're seeing is usually displayed when you're trying to set up NumberSync with an iPhone that's not on the same account as your watch, and it won't let you proceed because the eSIM was deleted from your watch. If that's the case, a new eSIM is needed. Learn how to get a new smartphone, tablet, or wearable eSIM with myAT&T.

1. Go to your myAT&T account overview.
2. Scroll to My devices.
3. Choose Manage for the device that needs a new eSIM.
4. Scroll to Options & settings and select Get a new eSIM.
5. Confirm your selection to Get a new eSIM.
6. Follow the prompts to complete your eSIM setup.

You can also try power cycliing your devices. 

Please let us know how this helps. Thank you for contacting AT&T Community Forums.

Lorie, AT&T Community Specialist

We've seen the EDS4014 error a few times before, @annettesanchez.

We're aware of back-end connectivity issues do to latency, and are working to resolve them as quickly as possible.

Please restart both devices and try again. If you get the same error, try back in 4 hours and let us know when you're devices sync up.

We're sorry for the problem. Thank you!

Keny, AT&T Community Specialist

How about error EDS0002

What about error message EDS0004?