This unique service allows you to block all incoming calls except those on your white list. Follow the below simple steps to activate/deactivate this service and to add callers or to remove callers from this service:
USSD
IVR
Service Activation
*256*1#
Dial 256 and press 1
Service Deactivation
*256*2#
Dial 256 and press 2
To add to white list
*256*3*<Number>#
Dial 256 and press 3
To remove from white list
*256*4*<Number>#
Dial 256 and press 4
To query white list
*256*5*<Number>#
Dial 256 and press 5
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