If you don't have a fancy NFC-enabled phone then it's hard to join the mobile wallet club. Fortunately, Barclays has introduced the PayTag that turns any phone into a contactless card. It's a square of plastic a quarter the size of a credit card that's sticky on one side -- yup, you just jam it on the back of your phone and hey presto, you can buy sandwiches, or any purchase up to £15 (£20 from June)
