I have got a Samsung S3 that forces me to use a 6-charakter password for the phone/SD card encryption. I would like to use a PIN (4-digits) as it was possible in earlier Samsung phones. I am aware of the reduced security but for practical reasons I want to use the PIN. What are my options? I see there is the option to use any kind of "file vault" app, but they require to move my files and folders into the apps container. Is there any option to encrypt the android leaving the files in the original place?