Why does my iPhone 4 lag when I play black ops zombies online?

It lags even though I'm at lowest graphic settings possible.

Does you and the person your playing with have a good strong internet connection? If you have a bad connection and are playing online it can cause lag and make it nearly impossible to play at times, try playing at different spots of your house to see if you can find a better connection. (and the mobile version always lags a little online)

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