About smart cards
Smart cards store certificates and private keys. You can import certificates from a smart card to your device by using an
external 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 smart card certificates with third-party apps that support smart card technology. And you can use smart card
certificates to send S/MIME-protected messages.