with most phones you can upload your contacts to your sim card. is there a way to do this on the iPhone? I can download the contacts off my sim but not the other way....
There is a Cydia app called SIManager. http://www.iclarified.com/entry/index.php?enid=7133
I tried it the other day but it didnt work right. Copy iphone to Sim button didnt do anything. Maybe I had to add them one by one, not sure.
Also this will only copy the name and phone number. If you have other entrys on your contact like address, email, URL, instant message, birthday etc.. will not copy over to the sim.
Best way is to do it thru address book on your computer IMO.