Jerry asks: I’m having a problem with an app on my iPhone, and I want to let a friend who’s better at this than I am see what I’m seeing on my screen. Is there some way to take a “picture” of my phone’s screen and send it to a friend for help? On desktop computers, this is a common request, and it’s easy to do. Both Windows and Mac OS X include built-in features to take screen shots. It’s built-in on the iPhone, as well, but there’s no way anyone would guess how to do it. To take the …