How do I unlock a U.S. Cellular R530U CDMA to GSM? topic

I bought a Samsung Galaxy S III U.S. Cellular R530U on eBay and it appears to be CDMA//LTE, though it has a SIM card slot.

I'm trying to unlock it so I can use it with my GSM carrier here in Israel, but none of the codes are working for me, like *#197328640#.

What am I supposed to do? I don't care if I only get 2G speeds, I just want it to work..

Thank you!