9to5Mac conducted a five-minute FaceTime call "with lots of movement" on a jailbroken iPhone 4, and in total it used 14.7 MB of data. That works out to about 3MB a minute. If you're FaceTiming all the time, that could add up quickly, but if you just call your friend up every once in a while because you feel like you should (feel like you should be using this new fangled video-chat function, that is) then you probably don't have to worry about it sending you soaring past your 200MB or 2GB limit. [9to5Mac]
How Much Data Does A 3G FaceTime Call Use?
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