How do I add or make changes to the existing 1511BLACKLIST service?

ZONE Telecom > Business > 1511BLACKLIST Service
To add or make changes to the existing 1511BLACKLIST service, simply apply the following steps:
 
1.    Go to our website at http://www.zonetel.com.sg.
2.    Login at the "Members Login Here". 
3.    Click on 1511Blacklist under My ZONE Plus.
4.    At “Call Barring Set Up”
5.    Key in the “country code”, “country code + area code” or “country code + area code + telephone number” that you wish to block.
6.    Click on “Submit” button to activate it.