iphone free ringtones is it possible?

Im wanting to purchase an iphone 3g. My friend has one and he says that you cant get free ringtones. Im all about ringtones lol. But he has his with att and im getting an unlocked iphone.

But my mom just asked her friend and he said that you cant. But i really want an iphone so if anyone knows if you can or not please give me info!!

Thanks