Thanks to all for the help on the other thread.
If I use USB Smart or SEMCTool 3.3 to unlock the phone using my PC, I have a cable which is T28 one end, and RJ45 male the other end. Can I connect this cable to my PC through any RJ45 to USB adaptor such as they sell on ebay where they call it "ethernet adaptor"? I don't think my computer has direct socker for RJ45, only USB.