move watch line number to iPhone

We're here to help shed some light on your inquiry, @taiegh. 

This is not an actionable request. Your Apple Watch was assigned the phone number for billing purposes and it is typically used as a placeholder. The phone number is not one that can be called directly so we won't be able to assign this number to your iPhone. If you're interested in changing your telephone number, follow the steps below to make the change online:

1. Go to Mobile number change.
2. Scroll to and choose the device you want to change the number for.
3. Follow the prompts to get a new number.

Good to know: When you change numbers, your voicemail changes too.  We can’t transfer your messages, so be sure to write down any important messages before you switch.

Learn what to do after you get a new number. 

If you're still wanting to cancel the line associated with your Apple Watch, please let us know to help us determine the next steps. 

We'll be awaiting your response!

Sydne, AT&T Community Specialist.