When I try to add my apple watch to my cellular plan I am getting the following error:
Something's not quite right
The phone number attached to this watch isn't matching the account you are logged in with
On your Apple Watch, if you go to Settings -> Cellular is there a plan listed?
On your iPhone, if you go to Watch -> Cellular is there a plan listed?
You may already have this solved, but I reset mine to factory just like it was when I first bought it, and when I was setting it up, it ask about cellular and it took me straight to Visible I tapped on it, agreed to everything and everything went very smooth. Then I had it download everything from iCloud and it was as it was before at the cellular work perfect. Might give it a try if you hadn’t already got it going.