GP Call Block : Active Code *111*1*1#, Deactive Code *111*1*4#

Any GP subscriber can subscribe to the Call Block service.
SMS: Type Start CB and send to 5678
USSD: Dial *111*1*1#
IVR: Dial 5678

Unsubscription Process:
SMS: Type Stop CB and send to 5678
USSD: Dial *111*1*4#
IVR: Dial 5678