Your Blackberry phone device lock disallows authorize access to your phone memory. The password of your Blackberry phone should be kept secret from your friends and loved ones, accessible to you alone. Always change your Blackberry phone password for security reasons and you can do this from the device menu.
1. Touch-hold the red “End Call” button of your Blackberry device to make it boot; touch the Menu Key and this will open the Applications section. Scroll to settings and touch the icon to open settings menu
2. From the Settings touch Options>Password>Reset Password.
3. Type in your old Blackberry password and hit the “Enter” key. Type in the new Blackberry password and hit the “Enter” key. Type in the new Blackberry password again and hit “Enter”