Research in Motion, the mobile phone maker, says that its BlackBerry 9800 is its "best BlackBerry ever."

The device, also known as the BlackBerryTorch, was unveiled at a press event in New York. The smartphone combines a touch-screen interface with a slide-out version of the Qwerty keyboard that the brand made famous. The device is based onthe new BlackBerry 6 operating system, which offers better web browsing experience and integrated social features.

The smartphone also has a universal inbox feature that combines instant messages from BlackBerry Messenger with updates from social networking sites, such as Twitter, Facebook and Windows Live.

The Torch, which has a 3.2-inch screen, automatically reformats and magnifies Web pages for easier viewing. Also, photos, music and contacts can be synchronized wirelessly between the phone and a computer.

Research in Motion also revealed the details of the BlackBerry 6 operating system. The new platform has a universal search feature across the entire device. The smartphone also allows users to browse album art and photographs

"This platform is the outcome of Research in Motion's ongoing passion to deliver a powerful, simplified and optimised user experience for both touch-screen and keyboard fans," said Mike Lazaridis, Research in Motion's co-chief executive.

The new operating system is seen as BlackBerry's tool in retaining its market position. The company is under threat against competitors such as the iPhone and the new generation of Google Android smartphones.