I think it's also important to factor in who has LTE and who does not. LTE, according to independent tests DOES use more data.

My own uptick is minimal, but as I said, I've watched it. I literally watched the numbers go up while downloading an app on wifi. Not a lot, but some.

With LTE set to launch here soon, I'm worried that my current 1G will not be enough. I normally use about 300mb, but since IOS 6 I'm using 500-600mb.