I am using an 8310 without a BB specific data plan, just regular internet and I have BB maps on my phone, along with google maps. Its all dependant on the service books your phone has and what at&t provides to you. It could be the fact that I did have the BB plan on my phone months ago with a diff carrier and still am running the service books from them(and have them all backed up in case). You can use gps without a cell connection, check out mgmaps for setting up pre-cached maps for your area.
Thanks for the heads up on Gmaps. I'd tried using a similar bit of software for my DS (Google Maps, cached, no GPS), but had no luck in getting it to keep the map tiles saved, despite having 8GB of storage space to play with.
I'll be acquiring a Storm soon, but I'm not interested in using it as a phone, so Gmaps may prove pretty useful.
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