Phone straps seem to be so very much a Japanese thing. As a matter of fact, I don't think I've ever seen one hanging from a phone in the U.S., but maybe I'm just hanging out with the wrong sorts of crowds.
If I were the type to clutter up my phone with tiny plastic characters or other bits of colorful nonsense, the Revolve strap would likely be the only thing that found it's way onto my mobile.
The Revolve strap is a tiny little DS knock-off that plays generic versions of classic games like Block Game, Shooting Game and, my personal favorite, Frog Game. Ah, that brings back memories of my misspent young: Drinking cokes at the Officer's Club in Yongsan playing Frog Game with my friends before riding home through the golf course on my bike.