How I heard the story:
When Apple announced the iphone, Nokia started negotiations with Apple and asked them to pay the same patent fee as everyone else in cell phone business. Apple did not want to pay. One year after the release of IPhone Apple still didn't agree to pay. As Nokia noticed some of Apples UI multi-touch patents were quite good, Nokia said ok, give us right to use your patents instead. Apple said no. Nokia sued Apple as they have been using Nokia patented technologies for years and haven't paid Nokia a dime. Now Apple is trying to twist story that Nokia is just after their patents. That is a lie. Nokia offered Apple same as everyone else from the start.