On June 20, 2007, Guelph Transit launched a web-based system known as "Next Bus". Global positioning system (GPS) technology and advanced computer modelling allow riders to receive accurate, real-time arrival and departure information via the Internet, handheld devices (including Palms, Blackberries, and Web-capable cellular phones), or their telephones. This system has proven frustrating to some Guelph residents, as Guelph Transit no longer posted paper copies of bus arrival times at bus stops; a user standing at a bus stop without a cell phone had no way of determining when the next bus would arrive. Additionally, the system's predictions have been known to be wildly inaccurate.