Soon the US will enter the modern world and require chip and pin for all credit card transactions. When this happens every restaurant will require those little hand held devices that they can bring to your table to allow you to enter your pin. These devices break, are a hassle to keep charged, and are generally a pain in the butt. The most reliable device, by far, is the phone you have in your pocket. I can't wait for the day when my receipt has a 2-d barcode that I scan which allows me to pay via a Paypal/Google Wallet type system. That way I don't have to trust your crappy POS system your restaurant bought on ebay to secure my credit card data. I can choose from a number of trusted vendors to secure my data and handle the transaction.