Verykool i674 - Manual (Page 15)

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9.1.2 Advanced settings
You can set the function such as auto redial, background sound, call
time display, call time reminder, auto quick end, connect notice,
answer mode and so on.
9.2 Network settings
You can set the SIM selection mode, dual SIM settings, flight mode,
network settings and preferred mode. In SIM1/SIM2 network
settings, you can select appropriate network.
Note:
Please do not register networks inconsistent with the SIM card,
so as to prevent unavailability of normal use. For details,
please consult your service provider.
9.3 Security settings
SIM1/SIM2 security: this function can prevent others from using
your SIM card without your permission.
You can change the password of SIM1/SIM2 PIN and SIM1/SIM2
PIN2 through the system prompts.
Phone security: this function is to lock and prevent other people
from using the phone without permission (default password is 0000).
You can change the phone lock password through the system
prompts.
Auto keypad lock: activate this function, when the phone without
any operation in standby screen, the keypad and screen will be
locked automatically after the set time. If you need to unlock the
keypad, you can press the lock or other application icon to the
middle of the keypad lock screen.
Certificate manager: store the certificates.
9.4 Restore factory settings
You can carry on corresponding operation after inputting the correct
password (default password is 0000).
After running the Restore factory settings, the environment setup
(e.g. user profile) restore to factory default setting.