In NZ in the early 80s there was a "RadPhone" service for recreational boaters over VHF --- you could call the Coast Guard operator on a dedicated VHF channel,

In NZ in the early 80s there was a "RadPhone" service for recreational boaters over VHF --- you could call the Coast Guard operator on a dedicated VHF channel, give them a phone number, and they'd make the call and connect it to that channel. Of course everyone else with a VHF radio could listen in.