Apparently, AT&T advertises its "works in more places like..." network in places where it doesn't even work. 
The ads are appearing in the tunnels and trains of Washington DC Metro, a real place, where AT&T really doesn't work.

I think before ATT works on getting their wireless network in places that don't exist, they should focus on getting their cell phones to work in places where they advertise cell phone service.
It's kinda like when I went to Walmart last week and waited in long lines for one of only THREE checkout people while Walmart's own commercial was playing on the TVs in the checkout lanes, saying, "This holiday season, we're employing more checkout people so you don't have to wait in long lines."  Thanks, jerks. #entertainment