How to activate ISD in NTC?

International subscriber dialling (ISD) is a service to call international number that is directly dialed by a telephone subscriber than the operator.

There are different ways to activate for NTC GSM Postpaid and NTC CDMA Postpaid.

# NTC GSM Postpaid

Activate:
Dial *#331*PIN#
Default PIN code is 0000

Deactivate:
Dial *331*PIN#
Default PIN code is 0000

Check Status:
Dial #*331#
Change default pin code:
Dial **03*331*old PIN*new PIN#

# NTC CDMA Postpaid

Activate:
Dial *82

Deactivate:
Dial *820

Change default pin code:
Dial *81

It is free to activate.