Gigaom report that Nokia are ceasing support for the N Series range of mobiles, the N96 amoungst the phones effected. Dig a little deeper however and it appears that what Nokia are doing is stopping bundling the VoIP client in the N96 package.
Possibly this is in response to pressure from carriers, who “give” the phones away for free and do not want to see users getting calls for free from the bundled wi-fi. Possibly, as some commentors say, it is because third party providers can do a better job of writing applications than Nokia can.
In clarification, Nokia have stated that the N96 will be VoIP compatible, but it will require additional software to get there, and existing providers, such as Truphone, are already working on a solution.