For more information on your device, select it on the Support main page.
To set a password to help prevent unauthorized use, in the File manager view, select the memory card and Options > Memory card password > Set. You are asked to enter and confirm your password. The password can be up to eight characters long.
If you insert another password-protected memory card into your phone, you are prompted to enter the password of the card. To unlock the card, select Options > Unlock memory card.