Depending on the amount of storage space available, you might not be able to encrypt files on your smartphone or on your media card.
You can set encryption to include or exclude your contacts. If you turn on encryption for contacts and you receive a call when your smartphone is locked, the encrypted contact information doesn't appear on the screen.
To stop encrypting data and files on your smartphone, in the Device Memory section, clear the Encrypt checkbox. To stop encrypting files on your media card, in the Media Card section, clear the Encrypt checkbox.