From Cellular News:
As a result of one of the first population-wide deployments of text messaging services, GP surgeries across Lewisham Primary Care Trust in London, UK have reduced missed appointments by 27% over the last year. The reduction has been attributed to surgeries using iPLATO Patient Care Messaging, a platform for text appointment reminders and other mobile patient services in UK Primary Care.
Neat. Sending a text reminder causes patients to be on time for appointments. That's a big benefit for such a small feature.