What do you need to transfer them for? If it's a device switch, keep in mind that a lot of SIM cards (at least "older" ones) have a limited capacity for phone numbers.
I'm not aware if anything has changed recently, but I'm pretty sure that all you can save on a SIM card as far as contacts go is a name and one phone number for that name.
That's it.
If you have any other information for a contact, such as multiple numbers (home, work, fax, mobile), email addresses, physical home and/or work addresses, birthdays, anniversary dates, other notes, you will lose them.
This was a leftover from the capability of dumb phones.
Best thing to do of you want a backup is sync with Outlook. Or backup with Desktop Manager if you don't use Outlook.