Patent ID: 7710292

Claim:
A data entry system comprising: a keypad for entering data into the data entry system, wherein the keypad is configured as a keypad having three columns of four rows each; the first row having three keys representing the numbers one, two and three, the second row having three keys representing the numbers four, five and six, the third row having three keys representing the numbers seven, eight and nine, and the fourth row having at least one key, wherein the at least one key represents the number zero; wherein the number two key represents the letters A, B and C, the number three key represents the letters D, E and F, the number four key represents the letters J, K and L, the number six key represents the letters M, N and O, the number seven key represents the letters P, Q, R and S, the number eight key represents the letters T, U and V, and the number nine key represents the letter W, X, Y and Z; and a mapping scheme for mapping the letters of the keypad in a predetermined order when a first key is pressed, wherein the first column includes the value of the number pressed, the second column includes each of the letters representing the number pressed and the third column includes the shifted versions of each of the letters representing the number pressed.