You can use a smart card and your device password to unlock your BlackBerry device. You can also use smart card certificates to send S/MIME-protected messages.
Smart cards store certificates and private keys. You can import certificates from a smart card to your device by using the BlackBerry Smart Card Reader or a microSD smart card. Private key operations such as signing and decryption use the smart card. Public key operations such as verification and encryption use the public certificates on your device.
You can use a smart card and your BlackBerry device password to unlock your device.
You can set your BlackBerry device to temporarily store your smart card password, so that you don't have to enter it as often. To clear the cache, lock your device.