This article says UK mobile marketing firm I-movo ” has launched its secure mobile marketing platform, which allows vouchers sent to consumers by SMS to be redeemed at retail outlets using existing payment terminal infra-structures such as stand-alone point of sale terminals and retail EPOS systems. The platform issues a mobile ‚Äòvoucher’, containing an individual identification number, which is delivered to a consumer’s mobile phone using SMS. Each number is checked at point-of-sale using the retailers’ existing EPOS or payment terminal devices. The electronic nature of the transaction ensures that the voucher cannot be used more times than is permitted by the issuer, and is limited to participating retailers within the duration of the promotion”.

I-movo launches mobile voucher marketing system