Q: I was at a coffee shop the other day and saw the coolest thing that I didn’t think you could do with an iPhone. This guy had his iPhone down on the table, and somebody called and the camera light started flashing. I’m positive it was an iPhone he was using, but I didn’t know that the iPhone could do that, and I can’t find a setting anywhere for it. Is it an app? I’ve found stuff on the App Store that lets me strobe…