I've taken to purchasing carpenter pants (both full-length jeans and shorts), mainly because the side pocket is a perfect place for putting my phone. I can't stand to have something as big as my wallet or whatnot in my back pocket, although I do have a smaller card wallet that I keep with my business cards, my driver's license, and my main credit card. That way, for the majority of times I might need my wallet, I can reach for the small one rather than the big one.