move iphone 3Gs contacts to sim

I want to move my iphone 3Gs contacts to sim card , is there is any legal way to do it?
my friends told me, iPhone does not support this action and I have to 'Jailbreak' my device, I hate to manipulate the original device software but in the same time I need an application to enable me to move my contacts to sim card, please advice.
Thanks.

I've never heard of doing this with the iPhone. Jailbreaking is probably your only option, but I have no idea if there is a jailbreak hack to do that either.

I am sorry to hear that!

I am sorry to hear that, no existence for such application! the only available headphone is a wired one! I am sorry to announce that, I will move to Android or even windows mobile, something can be utilized!