To enable the user to call a number independently, you can create a numeric keypad. The compiled number is displayed in the message box. To call the number, add the action for dialing the number that was compiled in the message box, to a cell.
Edit the cell (F5).
Click Add item Ctrl+click=Copy item in the Actions options group.
Choose Phone from the Actions drop-down list.
Choose Call from the first drop-down list.
Choose Call number from the second drop-down list.
Choose From message box from the third drop-down list.