Hi there, good morning.

Just bought this mobile new, but without SIM in it, it's with Orange...
I want to unlock it, but cant find anywhere how, or where...
I've got a Cruiser cable from my last SE phones, which I used to unlock myself, but no idea how to do this one.
Any help/info appreciated, thanks :)

You get the unlocking service here http://www.superunlockcodes.com/sony-ericsson-m600i/rs12wp9/ .This site provides the unlocking code and instructions.Through this you can unlock your mobile easily.