Verykool s810 - Manual (Page 35)

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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 PINs: if the PIN/PIN2 is activated, you can change the
current PIN and PIN2 through the system prompts.
Power on lock: set the function on and input the security code
correctly, correct security code must be inputted every time when
the phone is powered on.
Phone lock: input the correct security code to lock the phone to
stop others from using it or to prevent keys from being pressed
accidentally.
Change security code: you can change the security code through
the system prompts.
Fixed numbers: set the function on, the phone with the current SIM
card 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 with your network service provider for
more details.
Privacy guard: if activated, the phone will ask for a security code
before you can access the applications that you set to be privacy
guarded.
Network
Enter the network interface, you can operate as follows:
Search type: you can select automatic or manual type for
searching.
New search: re-search for an available network and manually
select the network you want to use.
Preferred network: the list of networks in your SIM card defines the
order of preference in which your phone will select a network in