Coded brothel/shop names in your phone.

[wilisno]

I don't use encryption, I just use password protected LockBox, that's for storing passwords of many things, including birthdays of friends and relatives that I don't want to share in public, work related codes etc.

[kamo]

Lucky I'm a small-time punter, just rock up without a booking (admittedly, don't always get the girl I want). Then again, I only go to 2-3 different places...

If needs be, I just google the number, then delete the history and call log afterwards...