I have a w850i locked to Three. Four weeks ago, I did extensive research, and there was no way. In total, I had flashed it some twenty times with different software and setups to no avail, always ending up at "Inactive SIM." I could use all functions except communicate. The Simox-patch does not seem to work. See my thread about it. I'm living in Norway, and none of the operators here work with it.