Phone Cube 5 is the cheapest-looking and -feeling case among the group, and one of the weakest rubber options we’ve seen for the iPhone 5. On a positive note, Phone Cube 5 wraps around the entire phone, leaving only the display and some of the I/O exposed. The rubber is incredibly thin, though, so much so that the Apple logo shows through the back. It’s also ill-fitting, particularly around the screen where the edges don’t sit…