I think the icon refers to the functionality on the LTE, not the BT version of the watch. Unless there is a voicemail app I am unaware of.I must be missing something pretty basic but I can't figure out how to access my voicemail on my Galaxy Watch (BT version). Can anybody help me. In some documentation I see an icon for what looks like a voicemail app but I don't have that app on my watch.
Most phone companies have a * number to access your voice mail. You should be able to save it as a contact and dial it.