Verykool s6001 - Manual (Page 56)

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The cell phone and SIM card use several accessing passwords. These
passwords help to prevent the cell phone from being embezzled.
You can use the function options in the security settings of settings menu
to change accessing password (except for PUK and PUK2).
PIN Code
PIN code (Personal Identification Number) can prevent the SIM card
from being embezzled. The PIN code is provided along with the SIM card.
If the PIN code checking is activated, it is necessary to input the PIN
code when the cell phone powers on every time.
If a wrong PIN code has been input for 3 times straight, it is needed to
input the PUK code, then input a new PIN code and input it again for
confirmation.
PIN2 Code
Some SIM cards may provide PIN2 code, while PIN2 code needs to be
used in some functions like Call Cost. These functions can be used only if
the SIM card supports them.
If a wrong PIN2 code has been input for 3 times straight, it is needed to
input the PUK2 code, then input a new PIN2 code and input it again for
confirmation.
PUK Code
PUK code (Personal Unlock Key) is used to change locked PIN code. PUK
code is provided along with the SIM card. If not provided, please contact
your local service provider for PUK code.
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If wrong PUK code has been input for 10 times straight, the SIM card