A newly-released hack for jailbroken iPhone 4 units allows for FaceTime calling over 3G networks. The hack, called My3G, has also allowed for a measurement of how much data FaceTime calls use.
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According to 9 to 5 Mac, a five minute call with “lots of movement” used 14.7 MB of data; this averages out to roughly 2.94MB per minute for FaceTime over 3G, compared to 1.3MB per minute for a 3G voice call over Skype. As for quality, 9 to 5 Mac claims that its editor couldn’t tell the difference between FaceTime over 3G or Wi-Fi, “the quality is that good.” More information on jailbreaking the iPhone 4 and installing the My3G hack can be found here.
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