Metal Gear Solid Mobile came out recently and exclusively on the Verizon network. I know noone really talks about cell phone games b/c most are absolute trash, but this project was under the guidance of Kojima.
I've never seen this type of game engine done on a phone before... I bought it the other day and the storyline is right after MGS1 (one of my fav games of all-time).
Check out a vid of a guy playin it on his crappy razr.
IGN: Metal Gear Solid Mobile Review YouTube - Metal Gear Solid Mobile 'Sneaking' Gameplay
They've done some cool things with the cameras on phones....such as taking pics and using that color on Snake's camo suit and also using the cam to track your viewpoint in the 1st person mode.