After reading how the dial-a-bouy works, apparently it just dials up a NOAA computer which then reads the bouy state and weather report over standard cell phone links.
Since both marine VHF radio links and cell phone link are line of sight I would imagine that if you can make a cell phone call you can also receive the weather report over the normal VHF weather channels. In fact, up in Vancouver Isle the weather channels were available when there were no cell phone coverage.
I would assume that it's an additional NOAA service, but it is somewhat redundant. Any comments?
Boris