My post about Transport For London enabling SMS and mobile web bus tracking in October remains popular on this site (not sure why), so I’ve been keeping tabs on what TFL are up to.
Some more information has been posted on the their website along with a likely screenshot of the service itself.
Sadly the service will cost your standard rate to send a message, plus a 12p charge to receive the response.
However the mobile web bus tracking will be free of course.
More info here