Voicemail on a Stand alone apple watch
I got my daughter an Apple watch and set it up under my phone under family setup. She does not have a phone. The watch has its own number and is not linked to my number. It works great but I can't figure out how to set up her voicemail. We use Verizon. When I select "Call Voicemail" from her watch I get a "Call can not be completed" message.
More info on the family setup.
Apple Watch