What are some free multiplayer iPhone/iPod games?

What are some free games that you can play online with friends on the iPhone or iPod? So far I have words with friends, and simpsons tapped out. Also are there any online games where 2 players can play together, sort of like on a console game?

Sas: Zombie Assult

1) Slice HD
2) Fruit Ninja HD
3) Foosball HD
4) Archetype
5) N. O.V.A. 2
6) Street Fighter IV Volt
7) Tower Madness HD
8) X2 Soccer 10/11
9) Archetype
10) Multipong

Try this games you can play multiplayer iPhone/iPod games

Battle Bears.

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This is the time that you will enjoy with your friends playing draw something online. Its a multiplayer game and a live game. For more info you can visit this: draw-something-online.net

Its for you phone. It's easy compare to laptop and PC.