My wife and I were able to upgrade to iPhones this past Monday we have a shared plan with 2GB starting out. I've only accessed online items while in my house so I was thought it was working off my wireless router - which both phones have access for. But both of our phones under "Cellular" are showing data usage for this period. So even if I'm sitting in my house, it seems I'm pulling usage off the 2G data plan instead thru of my WiFi router - correct? nIf so, I think we should keep Celluar Data feature in the off position and only turn it on when outside the house.