I purchased the 3G iPhone and want to use my original iPhone as an iTouch.  The crazy thing is that I lost the SIM card from the original.  I went to AT&T and was given a new SIM card, but now when I connect to iTunes my only option is to create a new phone line.  All I want to do is to convert the old one to a touch.  Very aggravating.  Does anyone have any guidance?