Okay, my cellphone contract anniversary is coming up this month and I'm seriously considering going back to a "dumb" basic phone. The dumb phone isn't the issue, but my question is how useful are the apps on an Apple 4S without the cell network? I can use it to surf if I find a wifi hotspot, but will the navigation apps work without the cell network AGPS? Any other issues to consider good or bad are appreciated. TIA