Nike Plus app
I just got an iPhone 4s - it comes with the Nike Plus app. When I open the app, it asks me to walk around to activate the sensor. It never moves beyond this screen, even if I walk for quite a while. What's the problem and how can I fix it? I've tried resetting Nike Plus, resetting all setting, turning the phone on and off, and trying it without the protective case on.
iPhone 4S, iOS 5.1