Re: "Apple Watch won’t connect to cellular data : I couldn’t connect my Apple Watch to cellular data, even though I had an active line on my Verizon plan for the watch specifically. I found out how to make it work and wanted to post - "
Thank you kindly for sharing your valuable experience, and your solution, with us ... here in the community.
This linked article contains Apple Support's suggestions: Set up cellular on Apple Watch
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Re: "I don’t think this is a known issue to the advisors so they won’t know how to help if you call"
Apple welcomes feedback, and provides a Feedback support website for our communication to those who work behind-the-scenes at Apple.
If you would like to send feedback, you could include a link to this discussion. They will likely not reply, yet all feedback is carefully read and logged. If others report a similar issue with connecting Watch to cellular data, there may be an update the addresses it.
Web-form for Watch feedback: Feedback - Watch - Apple