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When using FaceTime on a Wi-Fi connection your data plan is not used. Similarly, no cellular calling minutes are used during the video portion of a FaceTime call.FaceTime calling can be used over a cellular data connection with an iPhone.Using FaceTime over a cellular data connection (3G / LTE) will use your data plan. Five minutes of FaceTime video calling uses up to 15 MB of data.hen using FaceTime on a Wi-Fi connection your data plan is not used. Similarly, no cellular calling minutes are used during the video portion of a FaceTime call.
9to5Mac conducted a 5 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.fter figuring out how to use the iPhone 4's FaceTime feature over 3G, the obvious question was how much data does it use? According to a brief test by 9to5Mac, about three megabytes a minute.