No. I know the newspaper articles were a bit vague on this, but the provision actually prohibits the use of a phone outright, then makes a limited exception for telephone calls provided it is either in a cradle or you are using a hands-free arrangement of some kind (again, summary, don't rely on this etc). The drafting of the provision is less than ideal, but that's what it does - use the N900 (or any other phone) as a GPS navigator while you're driving, and you can be nailed. This is about the law - not common sense. The two rarely have anything to do with eachother.

I know this was a joke, but in case anybody takes it seriously, that distinction will not get far in a court - if it has a GSM transceiver and can make phone calls, a court will not have a second thought about calling it a phone. You might even have a problem with a laptop that has a GSM card, but then as a practical matter you wouldn't be able to use that as a navigator because it's rather difficult to mount it in a cradle on the dashboard.

As long as it's in the passenger's hands and the screen is not viewable by the driver (passenger relays directions), that may work, but if you have no passenger that is unhelpful.

"Use" means "use" - if you are taking advantage of its functionality, you are using it.