Three years ago AT&T took a hit at SXSW with terrible coverage due to unanticipated demand on their service from the then-new iPhone. I was there, and while I didn't have an iPhone at the time (I was still rocking a BlackBerry on Sprint) I did see the slow-to-nonexistent coverage iPhone users suffered. But AT&T learned from the experience and began boosting their coverage by using portable cell towers called "Cell On Wheels," or COWs. I got to tour one of these, parked right next to the Austin Convention Center, and spoke with a network engineer and AT&T's Seth Bloom ab
