If I have multiple accounts, can I set up 1511PIN for each account?

ZONE Telecom > Business > 1511PIN Service
If you have more than one account, you will also see a listing of all the accounts you have currently registered with ZONE1511.
 
You may create PIN to the respective account by applying the following steps:
1.    Go to our website at http://www.zonetel.com.sg.
2.    Login at the "Members Login Here". 
3.    Under Account Details, click on Manage Telephone Pins.
4.    Select your Account. 
5.    Click Add PINs. 
6.    Click Submit to save the changes.
 
Note:
•    Once you have registered a Telephone PIN for an account, all users using the account's registered numbers will be required to use their assigned PINs. 
•    Once you delete a PIN, you cannot use that PIN again within that account.