BenQ M300 - Manual (Page 131)

Menus 117
Phone Lock
Activates/deactivates or changes the phone's startup password. The
startup password prevents unauthorized persons from using your
phone. Once the phone's password is activated, the phone will be
locked down when it is turned on unless this password is correctly
entered. If an incorrect password is entered, your phone will remain
locked down, and cannot be unlocked even if the SIM card is
replaced by another one. When the phone is locked, you will only
be able to make emergency calls.
Once the phone password is activated, you must enter the password
each time the phone is turned on in order to unlock the phone
(there is no limit on the number of attempts to enter the phone
password).
The procedure for setting the phone password is the same as for the
PIN Code (the default phone password is 1234).
SIM Lock
Using this feature, you can prevent unauthorized persons from
using your phone with other SIM cards. After you activate the SIM
Lock feature, only the SIM card present when the feature was
activated will be accepted by the phone. If a new SIM card is
inserted in the phone, when the phone is turned on and a PIN code
is entered, the phone will request entry of a SIM Lock password
(there is no limit on the number of attempts to enter the SIM Lock
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.