I have an old 025 phone here that I want to use all the airtime up on since its becoming useless soon.

Anyway, i dont want people to call me back on it since it still has the orig users voicemail on it and I dont have the password for it and cant face dealing with telecom over it. 0197 doesnt work, any idea what does?

edit - tried *67 - no joy, also tried #31# and thats no good either