It's not possible to unlock the 6300 here (BB5?) but does anyone know of any UK based sites who can? Or how much it would cost me to get Orange to unlock it? Thanks..
As the phone is new you may have to wait 6 months before they will give the code. But if you say you are going abroad and need it unlocked that may go in your favour!
Orange CS can be touchy at times. The only way to find out is by calling them - but I see no reason why they would ask for you to pay any line rental up front.
All probability, they most likely add the amount to your account.
Note: All my contract phones have already been sim free, have you tried another sim to confirm it is locked ?