How is Nokia marketing the N900 ? Is it a phone ?
It is sold as a mobile computer with the Internet in its heart, and it was introduced as 'step 4 of 5' for tech leaders / lovers. If you want a mature Nokia mobile phone with extensive Java support and full SIM features then there are plenty of choices based on Series40 and Symbian. I think Nokia has been clear on that since http://maemo.nokia.com was launched this Summer.

Source : Quim Gil (Nokia) (http://wiki.maemo.org/What_can_we_realistically_expect)