Here is the link to the Modaco forum for a small cab file that quickly and easily removes the Orange certification on the Mpx200 .
http://smartphone.modaco.com/viewtopic.php?t=97152
To actually be able to download the file you will need to register with the site, it takes 2 mins and is definitely worth it, once you have registered your details the cab file will appear within the forum page as a downloadable file.
Now in order to get up and running do the following:
Download the .cab file. Then just drag and drop that file to the Mobile DeviceMy SmartphoneIPSMWindowsStart MenuAccessories folder on your phone (via Explorer). You need to make sure that when you copy the file it remains intact, i.e.
don't extract it first.
Then on your phone, click programs and open the accessories folder. In there you will see a file named "Alphaflux Unlock", just select that and it will tell you that its being installed. Its that simple, now you are unlocked!
Also included in the forum is the file to lock the phone again, this could be useful should you ever need to return your phone to Orange.
Now you can play Doom on your phone like everyone else!
Dave