Telecom New Zealand Customers: this code is
already set to "0N".
Australian Customers:
This code is already set to "OFF".
Digit Insert 0 Caller ID
To correctly display and dial Call ID numbers, you may need to insert a digit at the beginning of your telephone number. (eg: in New Zealand, Telecom requires a '0' to be inserted.)
New Zealand:
If you subscribe to Telecom New Zealand, this code has already been set for you to '0N'. If you subscribe to another telephone company, please set the insert 0 to "ON".
If this phone is used with a business PABX - consult the PABX manufacturer for the correct setting.
Australia:
For private household telephone lines, set insert 0 to OFF.
If this phone is used with a business PABX - consult the PABX manufacturer for the correct setting.
While the handset is on the base:
1. Press DEL button twice quickly. INSERT O OFF or INSERT O ON will be displayed.
2.Use 
and 
to choose on or off.
3.Press DIAL to store.