In the GSM digital system, there is already a system in place for Area Info, and you can turn this on or off within each phone choose what kind of info you want to recieve.
I haven't see it used, but I believe in someplaces in Europe phone companies can and do give traffic info and weather warnings etc to their clients.

Also I have been told that in some places they have local Blue Tooth Wireless points broadcasting services and businesses nearby.
To use you search with a Blue Tooth enabled phone or PDA then connect to the broadcasting device.