How do I change from 1511BIZ to 1511PREMIUM service plan?

ZONE Telecom > Business > 1511PREMIUM
To change the service plan, please visit our website: http://www.zonetel.com.sg for immediate activation:
 
1.    Login at "Members Login Here".
2.    On the Left Side under Call Plans, click on ZONE Service Plans.
3.    Select your Account.
4.    Select 1511PREMIUM under ZONE Service Plans and click “Submit”
 
Alternatively, you may contact our dedicated Corporate Helpdesk at 6720 6726 / 6720 6727 or email us at customercare@zonetel.com.sg for assistance.