I have an old iPhone 4S running iOS 6.0.1, Modem Firmware 04.12.02 and Model MC603C. It is currently with Rogers in Canada and I would like to unlock it so I can put in another sim card in it. I've been doing research and I can't seem to find an exact guide on how to unlock it. All I found was scam sites that claim to unlock it for a fee and I'd rather do it for free if I could. Can someone tell me if it's possible at all?