BenQ S660C - Manual (Page 164)

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Security
You can use a PIN code, phone password, and SIM card lock
authentication to prevent unauthorized use of the phone.
PIN Code
A PIN (Personal Identification Number) code is a password
provided by a network operator. When PIN code
authentication is activated, it will prevent unauthorized use of
the SIM card. Unless the correct PIN code is entered when the
phone is turned on, the SIM card cannot be used, even if it is
inserted in another phone.
PIN1 Code
Used to activate/deactivate or change the PIN1 code.
Before changing settings for the PIN1 code feature, the
previously set PIN1 code must be entered.
If you wish to change the PIN1 code, you must press
in the Enable item to select On, so that you will be able to
enter and confirm the new password.
PIN2 Code
Used to change the PIN2 code. The procedure is the same
as for the PIN1 code.
,
If the PIN code is entered incorrectly three consecutive times,
this will cause the SIM card to lock down, and a PUK1 code
provided by the network operator will be required to unlock it.
After unlocking, the PIN code will be automatically set to activate
once the phone is turned on.