If you subscribe to caller ID service with name display, you may have found that the name display feature that you pay for is broken on your N900.

This has been reported for Rogers and Fido, but likely affects other providers as well.

There is a bug posted, but it's unconfirmed, unassigned, has no priority, and the severity is set at the lowest available value.

If you care about this, please vote for the bug here:
https://bugs.maemo.org/show_bug.cgi?id=9644