Unlocking New LG CU500 gsm

I just received a LG CU500 that I bought off ebay. I assumed it was unlocked...wrong. My error. It is locked to cingular and I am on Edge wireless. so it doesn't recognize my sim card. Is there an easy way to unlock the phone so it will work. Thanks for your help!!

You should talk to that mobile company customer care or you see the website of that company.