I like solutions that mix old and new technology together, like paper receipt messages and e-payments. The right mix is much more effective than a pure electronic solution, which tends to be cumbersome and limited in capability. So I was interested to hear about this SMS payment solution being rolled out by an Abu Dhabi taxi company:
"After a taxi ride, you can follow the instructions on the card to pay the fare by SMS. You can type the taxi number and fare, and send an SMS to a given number. A confirmation message will be sent to the customer's mobile phone and to the electronic device in the taxi which will print the receipt."
Neat, simple, convenient, and works with any phone, now.