The iPhone does not support SIM card contact management (whatever you store in your Contacts – it gets stored in your iPhone by default and not to your SIM). However, there are times when you want to use some other phone and wouldn’t it be nice if your contacts were on the SIM, so that you can find them whenever you need, irrespective of the phone you use.
Those who have jailbroken their phone are lucky – there are iPhone applications that allow you to transfer your contact information from your contacts to your SIM card. These third party applications allow you to manage your contacts and export them back to your SIM card quickly and easily.
How to Export Contacts from iPhone to SIM
Use SIManager to copy all of your iPhone contacts onto your SIM card. SIManager also allows you to copy SIM contacts to the iPhone. It has a simple tap-button interface and shows different colors for your contacts to indicate whether they have been imported, deleted or edited. Note that it is applicable only for jailbroken iPhones.
Copy your contacts and text messages onto your SIM card using IBE SIM Card Manager. It is available by adding the following source to Installer.app, Cydia or other application managers: http://www.ibegroup.com/products/SIMCardManager.pxl
Install Dekart’s SIM Manager on your Windows PC to manage the contacts on your SIM card. Export your contacts from your iPhone to Outlook on your Windows PC, remove the SIM card from your iPhone and insert it into a USB smart card logon. Plug the smart card logon into your computer and use the SIM Manager software to export and sync contacts between Outlook and your SIM card. Dekart’s Sim Manager is available here and is available for a trial for free (see the link in Resources).