Can I restore and use my iPhone without a computer?

My friend used a restrictions password on his iPhone 3GS and now he gave it to me and he doesn't remember it. Can I restore my iPhone and activate it without a computer? It's on iOS 4.1 BTW

Yes! You can restore it but "no " on activating it without computer' maybe You are in ios 5! You can activate it over the phone'
:)