It seems like AT&T actually cares about how you feel about their network coverage, or at least they are trying to make it look that way.
For that purpose they just released a feedback app to the App Store to let you signal them whenever you have an issue and help them improve it.
It's called AT&T Mark the Spot and what's great about it it's that it will actually use your embedded GPS to let AT&T know where precisely they have to intervene.
What I am actually wondering about is how do you signal your lack of coverage on your iPhone when you actually have no coverage?
Can anybody explain this to me?
[Thanks to Kevin for the tip]