19. The system of claim 16 , wherein the digit formatting module is further configured to: identify a time of day at which the user-input set of text was received; and modify the unformatted digit string into the formatted digit string based on the identified time of day.
16. The system of claim 15 , further comprising a portable power source, a touchscreen, and a housing for carrying the processor, memory, power source and touchscreen, wherein the system is sized to be handheld or worn by a user, and wherein the processor is coupled among the memory, power source and touchscreen.