Bandwidth Usage: Facetime over Wi-Fi and Facetime over 3G
Here’s the pic posted by Andrew on Flickr — 29 minutes of facetime video calling over TMobile via Novatel MiFi wireless hotspot — and the data transfer breakdowns to approximately 1.5MB per minute.
The data usage further rises up after implementing Facetime video call over 3G. Tested by 9to5Mac, here is the screenshot of data sent with a 5 minute Facetime video calling over 3G.
So that’s pretty much it. Although Facetime over 3G consumes more bandwidth than Wi-FI, but its an acceptable usage especially if you’re on the At&T’s 2GB plan.