There are businesses around the country like Starbucks, and McDonalds(?) that use AT&T to provide WiFi to their customers, but in some cases you have to be an AT&T subscriber. Nintendo worked out a deal (presumably an ad-based deal) that allows any 3DS user to access these networks. Also, in NYC and other major metropolitan areas AT&T has WiFi hotspots in parks, bus terminals, and other places where masses of people regularly gather, so this is a very good thing.