Im selling my iPhone 3g to a co worker, I want to know if its safe to leave the old SIM in when I give it to him. What information could he access? Is there anyway he could use it to charge my account? Right now the phone is blank, I wiped it from the settings, put the sim back in and connected it to my mac so I can get past the connect to itunes screen? Would the phone still be usable without jailbreak and no SIM for him to sync and use as long as he doesnt restore it? Any info helps, thanks!