My iphone is lockup

my iphone is already unlock and i used it for a couple of month's,but last time i was playing games with my iphone about an hour,then it suddenly hangup,so i reset my i phone i closed the power and open again,but it shows the dockconnector and itunes music logo!so i get my dock connector and connect it to my computer and open itunes,it shows all program are gone.in tunes eppears that if have problem u can restore setting's by clicking the restore,so i click it and for a couple of minute's,then it appears on the screen that i need to put the original zimcard that used when i purchase it.the problem is i don't have the zin now!what should i do to used again my iphone,is there any easy solution on it?pls i need help for it