Google's Niantic Labs had a huge hit with the Ingress game on Android. It created something special with fans becoming ambassadors and creating meetups and thriving online communities. Now Niantic Labs has taken the next step by making Ingress available for iOS (link).
The IOS release works on iPhone, iPad mini and iPad. It is a game that get's you moving in your area. The in-game chat allows teammates (there are 2 factions in the game) to coordinate and do real world meetup.
So far, the game on IOS looks similar to the one on Android (no major changes). there are even reports that people have lost huge amounts of weight because it forces people to get out and move.