Do you sometimes feel embarrassed because you cannot recall a phone number? Try an alternative way to memorize phone numbers. Look at your cellular phone. Note that several letters correspond to the figure on each button. Only 1 and 0 have no letters corresponding to them, but only the ? and + signs. The program will show you all possible textual variants of the specified number. Select the one that you can memorize better and use it.
You can encode not only phone numbers, but any number.
You can use this method as the easiest way to encode your data. If you carry with you numbers that you do not want anyone else to know, you can carry a list of text strings with you instead of actual numbers. A regular person will think that they are not phone numbers, but some passwords.