I have a iphone 3GS, I'm considering switching to Verizon Droid or HTC or something, since I'm on my 2nd replacement phone and 3rd SIM card and AT&T keeps dropping my calls. My question is, what will my iphone be able to do when I no longer am paying AT&T anything? I know it will be an ipod touch with a mic. But will I be able to use the GPS app (Navigon)? Pretty sure I can't use google maps, since that uses 3G/EDGE data, but the Navigon app has all its data in the phone already, so that should still be usable, right? Also, will I still be able to download more apps when it is no longer an active phone? Any other surprises I'm not thinking of? Thanks.