I wonder if anybody else had encountered this... iPhone 5 touchscreen freezes up when phone placed ON TOP of another iPhone. It doesn't matter if the phone below is upright or upside-down, faceup/facedown, transverse or at any angles relative to the iPhone5.. Bring iPhone 5 a few centimeters apart from the phone below, and screen works again. iPhone 4 doesn't seem to display the same behavior... Weird.