Ingress is a near-real time augmented reality massively multiplayer online pervasive game for the android system. An iPhone app is expected to come out in the near future.
Although you can play this game by yourself, it is better to do so in groups. All over the net, you will find testimonials that, because of the game, they have made new friends for life. This is a very active and social game. It requires you to actually be at the real world location to be able to attack and take over what are known as Portals.
There are two factions in this game that one must choose to be a part of. The enlightened and the resistance. From the mobile app, or online, you can see the global standings for each faction and how much control each has. There is a lot to learn about this game, but how supportive the communities are, there is little to no reason why you can't figure it out and enjoy it.