Yes, you can also assign a PIN of your choice. To do this, please visit a TK customer service centre. To create a new PIN, you first have to enter your old PIN on the card reader. You can then assign a new PIN.
The PUK cannot be changed.
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You will need the PUK code if you have entered your PIN incorrectly three times. Entering the PUK will reset the PIN and you can then assign a new PIN.