Apple responded to Nokia's claims and counterclaimed late last month (thanks Groklaw): http://www.groklaw.net/pdf2/ApplevHTC-19-1-2.pdf Interestingly the N900 is mentioned specifically as infringing on three of the counterclaimed patents... The '647 patent: The '981 patent: The '905 patent: Reading the response it seems to me to imply that Nokia were seeking licences from Apple to these (and the other mentioned) patents in a cross-licensing deal. This suit seems to be the result of those talks breaking down.