The keylock option on your BlackBerry phone is set up to protect your programs, applications, e-mails, SMS texts and other private information. To protect you further, BlackBerry allows only ten wrong attempts at opening the BlackBerry. If the incorrect password is entered on the tenth attempt, your BlackBerry (no matter which series you own) will wipe all of your information clean. Although losing all of your data may seem like a scary thing, it's also the only way that you can reset your password if you have forgotten it. Of course, before you do this, you'll have to back up all of your information.
Connect your BlackBerry to your computer with your BlackBerry USB cable cord.
Open "BlackBerry Desktop Software" from your desktop.
Select the "Backup and Restore" option.
Click the "Backup" button from under the Backup title. This will back up your information, contacts, calendar and even applications to your computer.
Unplug your phone from your computer.
Enter an incorrect password into your phone ten times. After the tenth try, your phone will be wiped clean and the password cleared.
Plug your phone back into your computer using the USB cable. Open "Desktop Manager" again, and select the "Backup and Restore" option.
Click the "Restore" button from under the Restore title.
Open the most recent backup file from the Restore menu. Double-click the backup (.ipd) file.
Click "Yes" at the bottom of the warning dialogue box, and wait several minutes for your phone to be restored.
Disconnect your phone. Click "Options" from your BlackBerry Home screen.
Select "Security" and then "General Settings" from the Security Menu.
Click "Enable" next to Password to give your phone a new password. If you'd prefer not to have a password at all, click "Disable." Press the "Back Arrow" button on your phone, and click "Save."
If you do not have BlackBerry Desktop Manager, you can download it for free from the BlackBerry website (see Resources). Go to "Apps & Software" > "BlackBerry Desktop Software" > "Download for PC/Mac."