BenQ S660C - Manual (Page 166)

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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.