Banner option missing on my Nokia 6015i

I just got a hand-me-down phone from my boss and the person before me changed the banner and my boss asked me to remove it because it was unprofessional. Only problem is under display settings, it goes from color schemes to Screen saver time-out. And the number in the corner goes from 2 to 4. Why is the banner option missing? I tried to restore it to factory defaults, but the user before me must have changed it from the default security code, because it kept telling me the 12345 code was wrong. Please help me out? I don't understand why it's missing.