Origins of Hakamonapisai

The name "Hakamonapisai" comes from an old silly commercial for AT&T (I think?) where they were pitching that you would not be charged if you happened to dial a wrong number. In the commercial someone is trying to dial Frankfurt and they get a beach in Figi. A guy at a beach side hut answers the phone says,"Hakamonapisai" or something like that. I could never understand what he said so it became a sort of joke and how I answer the phone from time to time.