From Wikipedia:

Call of Duty: Modern Warfare: Mobilized is a 2009 first person shooter video game in the Call of Duty franchise, developed specifically for the Nintendo DS. The game takes place in the same setting as Call of Duty: Modern Warfare 2 and features many elements of gameplay typical to the series, including the usage of iron sights, and vehicular missions. It was released by Activision alongside the console versions of the game on November 10, 2009.