A good example for the data crunch operators world over are feeling situation is what has happened to AT&T since the launch of the first iPhone on its network, although 3G modems are also being blamed for an increase in traffic.
As a precaution to protect the already crumbling and decrepit network, Apple and AT&T chose not to enable FaceTime (Video Calls) on the 3G network and restricted it for Wi-fi use only.

