Accidentally, when your SIM card is locked it asks for the PIN code. Whenever you play around with security features of SIM card, it asks for PIN, PUK and security code. It’s better you avoid doing that.
The pin number is always same i.e 1234 in all NT GSM Postpaid and Prepaid SIMs. Many users reset PIN code on their own instead of original PIN. If you enter a wrong PIN code, you are asked to enter PUK code.
How to know PUK code in GSM Postpaid SIM?
To know PUK code in GSM Postpaid SIM, type PUK and send SMS to 100.
How to know PUK code in GSM Prepaid SIM?
GSM Prepaid users should dial 1607 and provide ICCID number printed on the back of the SIM to get PUK code.
How to get security code?
A security code is provided to customers while purchasing SIM card. If it has been changed they can get it sending text writing the code to 1400.