The link I provided for that SIM card reader includes a program for Windows, that allows you to edit, add, or delete your contacts on the SIM. I have bought many items from these people and they are dependable.
Bonus Tip: I have bought many flashlights from them [LED]. They have excellent prices and the quality of the lights is good. This one for a ridiculous $5.50 is very, very good. I bought 30 of them to give as gifts, twice. http://ledshoppe.com/Product/ledp/LP1004.htm
Here is the SIM card reader. Again, it includes the program whose interface is below. http://ledshoppe.com/Product/com/CA2008.htm