ESC UNDOES CARD INSERT/MODIFICATION
Press (ESC) while inserting a new PhoneBook card and any information you have entered will be erased. Press (ESC) while modifying an existing card, and any changes you have made will be eliminated. While this can be a frustrating feature if you hit (ESC) accidentally, it can also be very useful.
Suppose you accidentally typed over, or modified one of your most important PhoneBook entries. Press (ESC) before pressing (F10) (Done) and the original, unmodified card comes back. If you are adding a new card and change your mind, press (ESC) and it just won't be added. The point is that pressing (ESC) undoes whatever you've done to the card, as long as you haven't pressed (F10). ESC is really the Phonebook's "undo" key.