I was wondering if the 520 would make a good geocaching phone for my kids. I always cringe when I give them mine. It would have NO service, just use wifi. I'd either have a hot spot or use a different phone for the wifi. I didn't know how great the GPS was in the phone and if it relied on the cell service to assist it? I could also use it as a Skype/messaging phone so they had some option for communication with me. The bundle deal with Xbox Music is hard to pass up if this works.