Nokia may have signed a pledge of mobile allegiance to Windows Phone, but that doesn't mean its Symbian faithful have to play the part of the spurned lover. Espoo still sees a future for users of its other OS and plans to dish out the upgrades in two future steps, bearing such '70s disco queen-from-BK names like Carla and Donna. Details of these purported updates leaked out at the company's Developer's Day in Mexico where a blurrycam slide outed the planned progression for
