BenQ S670C - Manual (Page 178)

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password.
If the password is entered correctly, the phone will be able to
recognize the new SIM card and use it normally. The next time the
phone is turned on with this SIM card inserted, the phone will not
ask again for you to enter the SIM Lock password.
8
Your phone can recognize a maximum of three different SIM
cards.
Before setting the SIM Lock feature, you must enter the previously
set SIM Lock password (the default SIM Lock password is 1234).
The password must be between 4 and 8 digits in length.
Screen Lock
Used to create a security screensaver. When you
have not performed any tasks with the phone for a
set period of time, the phone will automatically
activate the screensaver shown on the left, the
purpose being to prevent personal information on
the phone from being viewed by others. To return
to the original screen, after pressing any key, you must enter the
password you set for this feature.
The steps for setting the Screen Lock feature are as follows:
1. You must first enter the Screen Lock password that was
previously set (the default password is 1234).
2. Press in the Enable option to select On, and then press
to scroll to the Timeout item.
3. In the Timeout item, press (Edit) or press to set the
period of inactivity before the phone will enter the Screen Lock
mode.