Verykool R23 - Manual (Page 35)

Flight mode: you can switch the phone between normal mode and
fight mode.
1.40 Security settings
1.40.1 SIM1/SIM2 security
SIM1/SIM2 PIN 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.
Change PIN/PIN2: you can change the password of SIM1/SIM2
PIN and SIM1/SIM2 PIN2 through the system prompts.
1.40.2 Phone security
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.
You can change the phone lock through the system prompts.
1.40.3 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 any
key, and then operate according to relevant screen prompts.
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