mobile chafing 

the gradual deterioration of pocket fabric where a cellular device has been repeatedly stored, thus, causing excessive rubbing that results in an irritated, worn out patch on a pair of pants

These jeans aren't from Abercrombie & Fitch, that's just mobile chafing.

All the change fell out of my pocket because of mobile chafing.

Darn you, mobile chafing! Now you can see my thigh.

mobile chafing by H Jr. December 13, 2010