iOS 6 conveniently tells you how much data you have used in a cellular FaceTime call (look in 'Recent Calls'). On my 4S I recently had a 15 minute call that used 37MB of data, or 2.47MB/minute. Can iPhone 5 users report on FaceTime over cellular data usage per minute? Also let us know if you were on 3G/4G or LTE. I'm interested to see if the HD front-facing camera is downscaled when used over cellular, and whether FaceTime over LTE uses data at a greater rate.