I just purchased my new iphone 4Gs and when I plugged it in to sync instead of backing up from my old 3Gs I clicked on "new" phone. It set it up, but didn't use the last back up I made for my old phone. I still have all my info on my old phone, but don't know if I should plug it back in since I thought it might lose everything? Any ideas on how I can start over? (having to use the USB since my laptop is not using a current enough os)