IMHO, using a handheld phone/BB/PDA will not replace a true stand alone GPS. First of all, there are very few apps that will give you turn by turn, voice commands and auto reroute (especially on a BB). Second almost all most of the apps that run on a cell phone require a data connection, so if you don't have cell coverage, you have no map application. Check out the GPS section for reviews of various Map applications and read what others have to say. Then go get atrial and try it yourself.
As for carriers, only you can determine that. You need to look at where you will be using the device and then pick the carrier with the best coverage. If you travel to Europe, I'd personally go with an unlocked AT&T device, but that is my preference, not yours.
Do a search on the STORM and also look in the 9500 section. Read the posts and then ask questions if you have them. A bit of legwork on your part, goes a long way on here.
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