i was in the middle of the ellipse on 10/8, and clearly heard/saw bono yell at the guy using his cell phone. however, right before he made that comment, bono yelled something else towards the direction of the back of the ellipse- but he didn't yell into the microphone, so i'm not sure what he said (it was definitely angry though!).
here's what i think happened: the ellipse SUCKED that night. apart from the first couple of rows, which were really into the show, the rest of the ellipse crowd was dead. there were SO many people just STANDING there, with their arms folded... it was really bad. and i think bono saw that the crowd was not enthusiastic, and that he took out his frustration on the guy with the cell phone. i'm not trying to justify his actions, but i do think that he was upset about more than just the one person using his phone. really, it was the worst ellipse crowd i've ever seen.