But you would have to buy Tom-Tom software and a GPS receiver (don't know if TomTom works with the internal receiver) anyway, so a bit of a moot point, you'd be as well with the (rather excellent) Nokia voice navigtaion. You can download the maps free from their website by the way.
from memory im pretty sure nokia use route 66 as their map database and this is a different satellite company as to what tom tom's use so cant imagine it will be compatible without having a third party application running it