OnStar Corporation is a subsidiary of General Motors that provides subscription-based communications, in-vehicle security, emergency services, turn-by-turn navigation, and remote diagnostics systems throughout the United States, Canada, China, Mexico, Europe, Brazil, Colombia and Argentina. A similar service known as "Vauxhall/Opel OnStar" was available in western Europe and "ChevyStar" in Latin American markets (except in Mexico, Brazil and Argentina). In September 2011 the president of OnStar stated that the service had more than six million customers. On May 9, 2018, Vauxhall Motors announced that Vauxhall OnStar, alongside Opel OnStar services, would cease to operate after December 31, 2020, following Groupe PSA's purchase of Vauxhall Motors and Opel from General Motors. A new aftermarket interior rear-view mirror with a built-in OnStar module, branded as OnStar FMV, became publicly available on July 24, 2011. It provides some of the features an OEM system has, such as Automatic Crash Response, Stolen Vehicle Tracking, Turn-by-Turn Navigation, and Roadside Assistance. Ford had "a similar system" named RESCU and it was introduced with Ford's 1996 Lincoln Continental. Ford's service is now SYNC. Overview The OnStar service relied on CDMA mobile phone voice and data communication, primarily via Verizon Wireless in the United States and Bell Mobility in Canada, as well as location information using GPS technology. AT&T announced the contract to replace Verizon in 2013 based on 4G technology from 2014. Drivers and passengers can use its audio interface to contact OnStar representatives for emergency services, vehicle diagnostics and directions. The OnStar service allows users to contact OnStar call centers during an emergency. In the event of a collision, detected by airbag deployment or other sensors, Advanced Automatic Collision Notification features can automatically send information about the vehicle's condition and GPS location to OnStar call centers. OnStar has 24-hour emergency call centers in Warren, Michigan; Charlotte, North Carolina; and Ontario, Canada, and other call centers in Makati, Philippines; and Oshawa, Ontario. This Advanced Automatic Collision Notification service is designed to assist emergency response efforts. All OnStar-equipped vehicles have Stolen Vehicle Tracking, which can provide the police with the vehicle's exact location, speed, and direction of movement. Starting in the 2009 model year, General Motors began equipping some new vehicles with Stolen Vehicle Slowdown. This feature allows OnStar to remotely slow down the stolen vehicle. The service is also expected to help reduce the risk of property damage, serious injuries or fatalities resulting from high-speed pursuits of stolen