How do I unlock a Motorola L2 phone with a Cingular sim card?

Can anyone help me with this? I have a Motorola L2 GSM cell phone that I got with my Cingular Go plan. I now have Virgin Mobile and would like to use my L2 if possible. I'm not a cell phone techie so laymans terms please. Thanks!|||You cant. Its only good for tmobile or cingular. Virgin mobile doesnt use sim cards.