REGARDING your comment on: http://www.quirky.com/products/447-Crossover-iPhone-5-silicone-bands-case. I had 2 Debit cards ruined because I would keep them with my cell phone. I was wondering what was going on with my debit card. It would only last a few months before getting corrupt. The bank people told me to not keep my debit card with my cell phone. After following their directions, i no longer had any problems with my debit cards. So, YES, cell phones can mess up your debit cards and credit cards since both cards use similar magnetic strips. Perhaps you ought to be more informed yourself before making comments. Peace.