Ericsson DT288 User Manual page 64

For example: to insert Ä press number five times; to insert È press
number four times and to enter a space, press number once. See
the table below for more details.
To insert lower case letters, press the letter first and then . To revert to
upper case letters again, press the letter and then . To insert an asterisk
(* ) in a name, press twice.
Phone book 64