Verykool I316BR - Manual (Page 18)

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This function can let you select the network manually or
automatically.
― GPRS Transfer Pref.
Select Data prefer or Call prefer.
4.8.4 Security Settings
― SIM 1/SIM 2 Security
 PIN Lock
PIN number setting can avoid unauthorized usage of SIM
card. If PIN number has been wrongly inputted for 3 times,
the SIM card will be locked. PUK number is needed to
unlock the SIM card. Please contact the network provider if
you don’t know the PUK number.
 Change PIN
Input old SIM1/2 PIN, and then input new PIN, input the
PIN code again to confirm. Before change PIN, you need to
turn on PIN lock.
 Change PIN2
Input old SIM1/2 PIN2, and then input new PIN2, input the
PIN code again to confirm.
― Phone Security
 Phone Lock
Input phone password to turn on/off phone lock. The default
password is 0000.
 Change Password
Input old password, and then input new password, input the
new password again to confirm.
4.8.5 Connectivity
― Bluetooth