If the BlackBerry smartphone is associated with a BlackBerry Enterprise Server (BES), the option to enable or disable the password may be unavailable. Contact your BES Administrator for assistance.
From the home screen, tap Settings. If not available, swipe down from the top of the display (where the time is located).
Tap Security and Privacy.
Tap Device Password.
Tap the Device Password On/Off switch to enable or disable .
Enter the password into the available field(s) then tap OK. Unless the device is setup on a BES, the default password type is numeric only. To setup an alphanumeric password, ensure the 'Simple Password' option (located below Device Password) is disabled .