BenQ Z2 - Manual (Page 136)

120 Menus
Connection
Used to set whether the phone will search for a GPRS network
when it is turned on.
GPRS & GSM
When it is turned on, the phone will search for available GPRS
and GSM networks.
GSM Only
When it is turned on, the phone will search only for a GSM
network.
Non-Networking Mode
If you select this mode, the phone will not search for any network
after it is turned on.
Security
You can use various codes and locks to prevent unauthorized use of the
phone.
PIN Code
A PIN (Personal Identification Number) code is a password
provided by a network operator. When PIN code authentication is
activated, it will prevent unauthorized use of the SIM card.
If the PIN code is entered incorrectly three consecutive times,
this will cause the SIM card to lock down, and a PUK1 code
provided by the network operator will be required to unlock it.
After unlocking, the PIN code will be automatically set to activate
once the phone is turned on.