We use my wife's Blackberry... not sure if she's running the Garmin app, or some other one. She's tried them all, so if anyone wants more info, I can ask. She also has Slacker Radio, so we can have the phone plugged in the car's Aux port and the GPS voice comes through the speakers as well. There's a small monthly fee for the GPS, but we don't have to buy new maps, so it evens out & we're always up-to-date. My T-Mobile contract expires in Feb, around my birthday, so I might finally get my own 
