i got a new iphone 4. i wanna give my old 3gs to my nephew, but i'm worried about security. i went to settings>general>reset> erase all content and settings. pressed both red reset iphone bars. phone shows apple logo, an empty bar, then shows a picture of an usb cable pointing to an itunes icon. i have restored the phone with itunes twice and tried again to erase with same results. is phone erased? is it secure. what will happen when he syncs it to his computer? any advise/comments?