Device security
Select
Menu
>
Tools
>
Settings
>
Security
>
Phone and
SIM
.
You can modify the security settings for the PIN code,
automatic lock, and SIM card change, and change codes
and passwords.
Avoid using codes that are similar to emergency
numbers to prevent accidental dialing of the
emergency number.
Codes are shown as asterisks. When you change a code,
enter the current code, then the new code twice.