Paying with your cell phone has been around in Europe and Japan for awhile, but we still are waiting for that technology to make it to the states. Here is a little hack that allows you to enjoy that functionality now. This will require a Visa Pay Wave card or some other RF enabled card. Weather you have a Visa now or not call your company and tell them you need an extra card with the Pay Wave or whatever catchy phrase is given to the technology. I think Chase calls it Blink. Visa actually has a mini card which makes this a little easier. Once you get the mini card trim it down so just the functional part of the card exists. I actually am unsure where this chip is exactly and the pictures are just examples.. Take that piece of the card and tape it to the inside of your battery door on your cell/smart phone. Now whenever you go to an establishment that allows Pay Wave / Blink just hold your phone over the Pay Wave / Blink portion of the debit card reader and off you go. Results may vary depending on the thickness of your battery door cover.