If you have a campaign that is based upon "more bars in more places" and have made claims about "fewest dropped calls" then you better know where your problems lie.
That's the idea behind a new iPhone app from AT&T, called "Mark the Spot." Personally, I would have named it "DropZone" as that defines what it really marks or "HoleFinder" as coverage hole is the term that has been around the longest.
It works as advertised, and I just reported that I don't have any AT&T coverage. Well, obviously. I'm in Madrid, Spain. Let's see how AT&T reacts to that.