I'm currently at my mothers house useing her Wi-Fi connection on my laptop to d/l iOS 4.2.1 or 4.2 which ever you perfer to call it. Anywho her internet connection is incredibly slow it says that it'll take 13 hours to download the 624.3MB file. Since I dont have all day to litterally spend here, I was thinking about useing the iPhone 3G thats on my account and tethering the internet connection to finish the download at home. However my question is since the update I'm downloading is for my iPhone 4, which doesnt have the tethering feature (I like my unlimited data AT&T) will I need be able to connest the iPhone 4 up to the computer and install the update? Or the second I unplug the iPhone 3G it'll all be done fpr nothing?