When you blacklist a number, it will not be able to reach you. To activate/de-activate this service or to add or to remove numbers from this service, follow the below process:
USSD
IVR
Service Activation
*257*1#
Dial 257 and press 1
Service Deactivation
*257*2#
Dial 257 and press 2
To add to black list
*257*3*<Number>#
Dial 257 and press 3
To remove from black list
*257*4*<Number>#
Dial 257 and press 4
To query black list
*257*5*<Number>#
Dial 257 and press 5
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