With regards to using a tablet for challenges, I can't speak for all brands, but I have a Sony Experia S, and I can do all the smart phone stuff. I went to the google store and downloaded the free android app and installed it. One key point - you must have GPS tracking enabled on your tablet or it can't find local stations near you (that are not on your favorites list), and won't give you challenge credits for posted prices. Once GPS is enabled, everything works fine. Hope this helps.