I have an iphone3g but I forgot my password Its disabled, How do I fix it?

I have an Iphone 3g and Its disabled heres the BIG problem 1, I can't do it with my itunes 2; Why because NO SIM CARD! HOW DO I FIX THIS? With my computer, or what? Btw How do put a sim card in a ipone 3g? I don't know how my sim card is in my old phone, but my old phone was stolen and never seen again so, Help Help Help Help Help Help Please

Your outof lock.unless you jailbreak it. However if you take it to an ATT store any (nice) clerk will let you barrow a sim card to activate it.

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