Summary Box: Nokia launches 3 smartphones

THREE NEW MODELS: Nokia unveiled three mass-market smartphones, including what it calls the world’s smallest touch-screen smartphone and one with an exceptionally bright display.

THE SYSTEM BEHIND IT: The phones are based on the Symbian platform, which some developers see as clumsy and dated. Nokia plans to launch phones with Microsoft’s Windows Phone 7 later this year. Still, Nokia insists it’s not scrapping Symbian anytime soon.

WHY NOKIA IS HURTING: Nokia is being increasingly squeezed in the low-end market by cheap phones from Asian manufacturers and in the high end by Apple Inc.’s iPhone, Research in Motion’s BlackBerry and others.