Originally Posted by
Renes Points
Step 1 you should have a very secure lock on your phone to begin with (finger print or hard code).
Step 2 just make a folder and take photos of everything (front and back) and put the photos in that folder in your phone. Simple!
The vast majority of phones do not encrypt the flash system. All one needs to do connect via a debug cable (USB on most phones) and they would have access to the files. Your secure lock does not block that.
Unless you know that your phone has an encrypted flash system, you should not store sensitive data, unless you have some app that encrypts the specific data.
Personally I do not consider my passport that sensitive that I would care about it. But I would never do the same with key data for my main financial accounts.