As you haven't had the replacement for long probably the simplest way for you to try a debranded phone is to hard reset it (reset button and both 'soft keys' held in then press X to wipe the phone), wait until the phone restarts then before the Orange customisation script kicks in properly press the reset button again. You should restart to a completely vanilla install of WM2005, if you want to add in specific parts of the ROM have a look on XDA developers ftp site for that. You will also need to set up your data connections manually, the settings should be on here somewhere.
Edited by Shuflie, 16 June 2007 - 06:09 PM.