In Australia, visitors who pre-register online for events like concert or exhibition, can receive the usual confirmation via e-mail but also a barcode by SMS to their mobile phone. At their arrival at the show, they just have to present the barcode and have it scanned at the door to gain access.
The delivery of registration information by sms cut postage and handling costs in the pre-registration process, is fast and the message reminds the visitor of the coming event.

The system was developed by Sydney registration specialists Info Salons Australia in co-operation with message experts LegionONE.
From ZDNet via Textually.