From the ntl User Guide for Cambridge:
Quote:
To override Call Barring press . . . . . . . . . . . . . . . . . . . . . . . .* 80
You will hear a fluctuating dialling tone
Enter your 4 digit PIN
Dial the number you require
When you hang up Call Barring will automatically be restored
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Are you getting the fluctuating dial tone after dialling *80?