IPhone is disabled and waiting for activation?

Okay, so I have an iPhone first generation, that i use just as an iPod. Well, I put a lock on it in my sleep I guess, and now it is disabled… Well, I guess I didn't activate it? Because when I turn it on, it says, iPhone is disabled, and then it also has a alert that says, "waiting for activation this may take some time" so um… Then I connected it to iTunes, and it says it can't connect because I have a pass code and I would have to enter the pass code. And I don't know it. Anyone know what to do? Could you give me step-by-step instructions?

Just back it up to itunes. Then it will need you to figure out the code, there's nothing else to do except that.

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