debrand se903

hi i am new to this, i would like to know if you can debrand my 3 phone so i can use it on o2

thanks

Welcome retep, First i want i you to understand the difference between Debrand and Unlock, debranding, well, means flashing with the GENERIC firmware or retail version (the phone will still be locked but changes in the phone software) and unlock means unlocking the phone for use with any sim card without changing the phone software.