Those with iPhones:- Does the wifi stay on and CONNECTED, even when the phone is asleep/display off? ie. if you were on meebo or something on an online messenger in safari (and indeed on ichat when it comes), could you put the phone to sleep/turn the display off, and still stay "online", or does it cut the wifi connection off when you Sleep? What about the edge connection, does this behave the same? Thanks.