I use a pseudo-random number generator to pick my passcodes and I change it once every 15 minutes, just to be super-secure. That's how I can be confident that nobody will see my top-secret data, such as the note saying "bring bread and milk on the way home".
Of course that means that once in a while my passcode is 1234 or 0000!![]()
Ha! I have that beat. Not only do I cycle through different lock codes evey 500 milliseconds, I keep my iPhone in a sealed, lead-lined faraday cage encased in a foot of concrete. You can never be too careful.
I do carry around a wallet though, and my cash, driver's license, credit cards and medical card are all in human-readable plain text with no security. hmm