I need a phone number for my watch?
This is such a pain for me. Cellular will not connect on my IPhone S6 Plus because the SIM card is from my 5 phone. Who knew?
Apple Watch
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Set up cellular on your Apple Watch
https://support.apple.com/en-us/HT207578
If you carrier will not support your current iPhone SIM, then you need to work that out with your carrier.
The Cellular Apple Watch shares the iPhone's phone number. This requires the iPhone cellular carrier to support the Apple Watch. The iPhone carrier charges a monthly fee for this service. In the U.S. the fee is $10 per month added to your iPhone bill.
iPhone Cellular Carriers that support the Apple Watch, which models, the radio frequencies each model uses, and the country where they offer service:
https://www.apple.com/watch/cellular
Your carrier Must be listed by name in the above link. NVMO's that piggy back on another carriers network, unless explicitly mentioned, do not support the Apple Watch.