"The N900 does not have the most feature complete phone
experience in the world.
"Advanced phone users may be disappointed to find out that there
are currently several features missing from the N900 phone
application. For example, you cannot set a different ring tone for
different contacts, you cannot group or categorize your contacts,
there is no voice dial, etc. Now, some of these features may appear
in the near future as a firmware upgrade, but for the moment they
are missing. This, I believe is why Nokia doesn't want to call the
N900 a smart phone. The phone application is just another
application on the device, not necessarily the most important.
"The N900 is not the best music player in the world.
"From several reports by early owners of the phone, the sound
quality of the N900, both through the external built in speakers
and through the headphones, is better than average. However, the
built in music player has some features that some users may sorely
miss. For example, there appears to be no built in equalizer, and
there is no way to control music play from the provided headset,
one would have to get a bluetooth headset for this functionality.
Also, playlists are not as robust as in other players and have a
bit of a learning curve since they work a bit differently.
Nevertheless, it is good to note that there are other media players
available for the N900 that do offer some of these features and
that may be a better fit for some users."