Program codes for samsung

Does anyone know any program codes for samsung phones ? i have the f300 and seen a thread with a "sound trick" code which would have been ideal as the phone is really quiet but it would not work properly although i think it was just a wrong digit or two as it told me the last 4 numbers were incorrect, and it hid what i was typing behind minus signs like a password. the thread is here if anyone wants to check what i'm talking about:

http://forums.afterdawn.com/thread_view.cfm/493728

the first part of the code thats given in the 1st post, by obzdadon, is incorrect, the 5th post, by djmazz, tells you to rearrange the first part. you'll see what i mean if you're interested enough to look.