I have a LG Tribute LS660 from virgin mobile. I am trying to get it unlocked but don't know what kind of phone I got. I took the back cover off and see what I believe is a sim card. Is my phone a GSM or CDMA? I think if you have a GSM then you have to get a code to unlock it and if you have a CDMA phone you have to have it flashed? Is this correct?

That would depend on the original carrier the phones are usually available in both flavors