there is no default unlockcode for this phone new samsung series have MSL security and need to be unlocked by cable you can go to your local unlocker or do it yourself if you want to do it self you need an original samsung cable type PCB093LBE of this cable is a Switch with a small piece of rubber, remove te rubber and place the switch in DL mode then go to http://www.UnlockSamsungOnline.nl and get the unlockclient, get an account for unlocking, and login select your comport (com1 or 2) and select C300 now press the "Direct Unlock" button and your phone is unlocked in a few seconds
