I wonder if this particular iPhone case would make your phone kind of unwieldy. Or if that even matters when it just looks so cool. It's silly, I know, but I've seen much sillier phone cases and let's face it, this one is kind of bad@$$, right? But you know, I think that those grips might make for a comfortable phone call, even if it does void your warranty to use it as anything but a phone case. $99 at Knuckle Case.