Pocket Uno is a Windows Mobile version of the classic card game, whereby you need to be the first person to get rid of all your cards. It's a faithful recreation of the original, with the same colors and designs on the cards and exactly the same rules.
There are several options available in Pocket Uno to help you customize your games. There are three difficulty levels, controllable animation speed, plus the ability to toggle on and off the background display. Unfortunately though, you can't change the number of computer opponents (it's set at three) and, more crucially, there's no multiplayer option.