I have a question. If my Android device gets stolen but its screen is protected and locked by 4-digit passcode I think it's not hard for the theft to test it out from 0000 to 9999 , right? He keeps the phone within the environment without WiFi and cellular network. Could he break through my phone and get access to the data inside? OK. My phone is now still here but it keeps a lot of important and confidential information that includes text and pictures. All of them are backup regularly. I am not worried about they get lost because I awlays have copies, but I am worried that my phone gets stolen and unauthorized someone could copy my data What I can do to enhance the security of my mobile phone so that once the device gets lost or stolen then I can make sure that nothing inside can be accessed ??