Verykool R80L - Manual (Page 27)

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5.10.6 Security settings
SIM lock: this function can prevent others from using your SIM card
without your permission. After the SIM card PIN code is activated,
correct PIN code must be input every time when the mobile phone is
powered on; otherwise you can only make emergency call.
Note:
PIN code is the operating password and relative with the SIM card.
The SIM card will be locked, if the PIN code is wrong for 3
consecutive times. At this time, you need the PUK code to unlock
the SIM card. The PUK code may be provided for you together with
the PIN code and the SIM card. If not, please contact your network
provider.
Phone lock: this function is to lock the phone and prevent other people
from using the mobile phone without permission (default password is
0000). After enable the phone lock, you must input the correct password
every time powering on the mobile phone, unless the mobile phone
cannot be used normally.
Auto keypad lock: after this function is activated, when the phone is in
standby status and without any operation, the keypad will be locked
automatically after the set time. Then the standby screen will show
keypad locked icon. At the left bottom corner of the screen, word of
Unlock will appear. If you need to unlock the mobile phone, you can
press PWR key, and then operate according to relevant screen prompts.
Fixed dial: after the function is activated, the mobile phone is only
allowed to be used to dial the telephone numbers existing in the list. To
turn on the function, you need to input your PIN2 code. Please consult
your network service provider for specific situations.
Note:
When the Fixed dial function is active, the function of SIM card will
be restricted, such as dial call, send SMS, and send MMS and so
on.
Barred dial: this function needs to be supported by SIM card. Please
consult your network service provider for specific situations.
Change password: you can change the password of PIN, PIN2 and
phone password through the system prompts.
Certificate manager: you can view the certificates.
Remote control: enter into the password inputting screen, you can
enter the security control menu list if you input the correct password
(default password is 0000).