Auto Trader

You can do this with the Autotrader Mobile app for iOS devices, an app that enables the user to search and browse the Auto Trader full listings for cars and bikes near you, and when you locate the vehicle of your choice you can call the seller right from the app or save it for later with the garage function...

Source: http://www.phonesreview.co.uk/2011/04/19/autotrader-uk-mobile-app-new-used-cars/