In WP7, Nokia give their navigation app (which is clearly superior to the bundled Android one) for free. There is no yearly fee for it. And you can download entire countries onto your phone and run it 100% without a data connection. If they'd gone with Android, this would have been the model they'd have likely adopted.
Just because you claim to live in an area that AfriGIS (Google) is better than Navteq (Nokia), doesn't change the fact that on the whole, Nokia has a vastly superior mapset to Google. I work with a lot of GIS clients, and the best way to get one to fork out the extra dough for TomTom/Navteq data, is to get them to try the AfriGIS data. It's BAD.