Reply To: IPhone Battery drain
That is correct — at least for my phone. Obviously, if you want to make sure as to which way the data goes, you would have to turn off the cell connection. For my phone, when I put it in airplane made, that turns off all connections, then I can turn on the individual connections that I want. But, with both the cell and wifi on, data requests go thru any established wifi connection, and the cell connection is still used for phone calls and sms messages.
Bottom line tho — each of those connections you have on, you are adding the the battery drain.