Surface area is irrelevant to bending. It's how the force is being applied that makes the phone bend. That's why all the videos that show people bending the phones do not involve them placing the phone vertically against their leg. They bend the phone by having most of the surface area underneath the phone unsupported. That's obviously not going to occur if the phone is placed vertically in your pocket against your leg.
9/24/14 at 8:21am