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I had a white iPhone 4S for over a year naked and never saw any discoloration whatsoever. I kept it pretty clean but I would think the 5 would be the same. Do you keep starbursts or hershey kisses in your pockets or something?
 
I'm also wearing raw denim and I haven't seen any discoloration that couldn't simply be wiped off in the two weeks I've had the phone.

Granted, this pair of jeans has been soaked a couple times, but still.
 
Just got my 4S replaced at Apple and within a day of being in my jeans there was blue staining on the edges. It has rubbed off however, without any effort from me to clean it off. I'm guessing the phone just get a little "worn in" and then doesn't stain afterwards.
 
Just got my 4S replaced at Apple and within a day of being in my jeans there was blue staining on the edges. It has rubbed off however, without any effort from me to clean it off. I'm guessing the phone just get a little "worn in" and then doesn't stain afterwards.

Yeah I was able to rub them off immediately. What was difficult was that crevice in between the edge and the screen.
 
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