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), without opening your wallet. The sticky squares will be rolling out exclusively to British Barclaycard customers over the next few months, although we're not sure what it'll do to the trade-in value of your handset.

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