Nokia s hares rose up to 17 percent on Wednesday on rumours of Lenovo's interest in the company, b ut gave up all the gains after t he Eu ropean chief of the Chinese PC maker dismissed rumours as a joke. Once the world's dominant mobile phone provider, Nokia was wrongfooted by the rise of smartphones and is struggling to keep up with Apple, Samsung and Google. To read more on Nokia's troubles please see below: Nokia scraps phone software to conserve cash -sources Moody's c