Select Menu > Tools (or Ctrl. panel > Phone) > Encryption.To encrypt selected memory:1. Select whether you like to encrypt Phone memory, Memory card or both. When encryption in not set, status is shown as Off.2. With memory card encryption choose encryption/key option;Encrypt without saving key – Encrypt the memory card without saving the encryption key. This means that you cannot use the memory card in other devices, and if you restore factory settings in your device, you cannot decrypt the memory card.Encrypt and save key – The encryption key is manually saved in the default folder. Remember to store the key to a safe place outside the device. For example, send the key to your computer. Enter a pass phrase for the key and a name for the key file. The pass phrase should be long and complex.Note! If you want to use encrypted memory card in another compatible device you need to copy/send key file to that device.Encrypt with restored key – Encrypt the memory card with a key you have received. Select the key file, and enter the pass phrase.3. Device will proceed with encryption. Time needed for this depends for example on size of memory and data stored there. When process is complete, status of the selected memory is changed to On.To decrypt selected memory:1. Select whether you like to decrypt Phone memory, Memory card or both. When encryption in set, status is shown as On.2. With memory card decryption choose decryption/key option;To decrypt the memory card without destroying the encryption key, select Memory card > Decrypt.To decrypt the memory card and destroy the encryption key, select Memory card > Decrypt and turn off encryption.3. Device will proceed with decryption. When process is complete, status of the selected memory is changed to Off.