According to the reports, the suit--filed in U.S. District Court in Manhattan--contends that Digitopolis' Fake Watch and Fake Watch Gold Edition time-displaying iPhone apps improperly use Cartier's trademarks. Apple is being sued for allowing the apps for download on its App Store.
As of this writing, both apps were unavailable on the U.S. App Store.
Update: Cartier dropped its action after Apple removed the apps from its App Store. See Apple and Cartier Resolve Legal Tussle Over iPhone App
This story, "Cartier Sues Apple for Trademark Infringement" was originally published by Macworld.