Read the updates... some of that, if not a lot of that has been rendered inaccurate. The carrier updates, even now have yet to come over the air (OTA) and have, since 2.x been via the iTunes app.

The likelihood of all data being stored is unlikely; however I do believe that usage, time and a few other diagnostics, on top of the normal (and never quite explained ) data that's now being collected now included FaceTime.

But I will say this. What they do gather, doesn't offend me, but I'm watching them. I suggest that others to. And their recent changes to the iTunes store policy are starting to get the attention of the US Government... so this kind of stuff needs to be brought to their attention to, imho.

But hey... let's see what happens. I'm just giving an odd opinion out of many that could exist. Thanks for posting this.