In a "How To Thread" I will be posting a link to a SIM card reader for purchase that includes a program to read the SIM card contacts. It allows you to enter contacts on the card from the interface on the PC. I think it was about $10 shipped.
I have to run right now [actually, go on my road bike], but as I recall in looking at my SIM card interface on the PC, there was room for 250 contacts.
ALL YOU CAN ENTER IS THE NAME AND PHONE NUMBER! There is no provision for addresses, e-mail, etc. I suspect this limitation is to not overload the SIM card space, which is fairly small.
Here are some teaser pics: