A brief history is that the first stations were funded by a whipround . This has turned into a fulltime job for me, Rod Buck, their inventor. Each station costs around 2500 to 3500 to erect, and, as the annual subscription is only 30 or so, it therefore takes around 100 new subscribers to fund each new station. So, each time 100 new guys join the service, I use the money to build and erect another station. You also get access to the data from the stations on the Internet, via our website.
Subscribers call the actual station itself - wherever it is.
The call costs only 5p or less, usually. The voice quality is superb - clear and natural, not at all robotic. Because the numbers are normal BT numbers, they can be called from workplaces which bar outgoing calls to premium-rate numbers. Each Wendy station is on a normal BT number for subscribers use. When you call the station, it asks you to enter your PIN code.