I am trying to clear my 3GS to sell. I cleared it through itunes but I'd like to clear it again. The problem is that I took the sim card out and it won't connect to itunes again so I can re-clear it. Is there another way I can re-clear it without a sim card? It won't let me do it through the phone because it is not set up. I cut that sim card down to fit in my new phone. Is it that important to clear it more than once?