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I tested your App, but I can't reproduce it (HTC Sensation, Android 4.0.3). When I double click on Android Back button it goes to the previous page. Maybe there are some exact steps on how to reproduce it?
I managed to figure out the problem a few hours ago but was still testing on some other phones before i confirm.
I think the problem was brought about by having the Invoke services on Page show event. Because when I moved all services to the Load Event everything was okay.
Thanks for giving it a try too 