said by MRCUR:In the long run, WiFi will use more power. 3G is more power hungry when you're pounding data and moving around (jumping towers). Just checking emails isn't very data intensive and as such it's not a bad thing for 3G to be used.
With iOS 4.2, persistent WiFi was added. If cell data is not available, the WiFi should stay connected.
Oh, ok. I guess that would make sense then. As for the phantom data issue being reported by this lawsuit, AT&T has to at least explain themselves. I can definitely understand the concern of customers about this when there are data caps involved and potential overage charges.