Orange and Barclaycard have just announced a joint venture whereby you can use your Orange phone to purchase items up to a maximum of £15 per transaction just by waving your phone over a special device at the till.
However, there is only 1 phone you can use at the moment and that has only just come out. Hopefully there will be some Android phones and here's hoping the next iPhone will have the NFC contact less technology in.
So if you are lucky enough to have one of the Samsung Tocco Quick Taps then you can use it in Subway or Pret a Manger to start with. Don't forget to get the App to allow you to top-up the phone upto a maximum of £100.