You need to search for "Operation Elop". There's a free e-book that details the whole thing to a striking degree (I was at Vodafone at the time, and... well... What I know confirms all of it).
Note - full book on medium - it makes my Firefox on Android cry...
> This page hosts various alternative formats of the Medium book Operation Elop which is an English translation of the original Finnish book Operaatio Elop. You can read the story of this translation project over at Nokia People, a forum for ex-Nokians. The English translation is made available for free, with the permission of the original authors, under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) license.
