Transfer iPhone contacts to sim card

How can i transfer the contacts on my iphone to my sim card. I looked for apps on cydia but there was nothing.
Answer #1
I don’t think you can really, I never did this with my iPhone.
But looking at this topic here:
http://forums.mactalk.com.au/37/60049-copy-iphone-contacts-sim-card.html
Maybe it should help or so
Answer #2
I know you were able to with SIMport but i cant fi it on cydia