I found my old iphone 3g, but can't remember the restrictions passcode. Any way to bypass it?

I found my old iphone 3g, and want to use it as an mp3 player for my niece. However, I can't, for the life of me, remember the pin I set for the restrictions, and I can't reset it without that. Is there any way to reset it without that pin? I already got everything I wanted to keep off of it, so I'm fine if everything gets deleted. Like I said, I want to give it to be niece as an mp3 player, but want it reset first.