Samsung 5400 - Manual (Page 28)

28 Handbook
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8 Press the Start key to save your entry. The display shows
NO=<CALL BACK NO.>.
9 After the display clears, use the numeric keypad to enter
the telephone number for call back messages.
Enter up to 20 characters.
! Use the 14/Space One Touch key to enter spaces.
10 Press the Start key to save your entry.
11 Press the Select Function key to finish.