Reset BlackBerry 8900 Curve hard reset
Remove and reinsert the battery.
From menu select Menu key > Options > Security Options > Security Wipe > Enter "blackberry" (without quotes) then press the Wipe button on screen.
- To delete data from the messages application, contacts application, and other applications, select the Emails, Contacts, Etc check box.
- To delete all third-party applications that you have added, select the User Installed Applications check box.
- To delete all files from your media card, select the Media Card check box.
Warning: All data on your phone will be deleted.