Verykool i725 User Manual page 30

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.
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 SIM1/SIM2
PIN and SIM1/SIM2 PIN2 through the system prompts.
5.8.7.2 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.
5.8.7.3 Auto keypad lock
After this function is activated, when the phone is in standby status,
the keypad will be locked automatically after the set time. Then the
standby screen will show two small lock icons, sliding lock icon
above to the lock icon below, the phone will unlock.
5.8.7.4 Change password
You can change the phone lock through the system prompts.
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