Siemens Hicom 150 E - Manual (Page 57)

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Key utilisation
To enter a character, press the appropriate key the relevant number of
times or until the character appears.
The first letter of a word is automatically written in upper case letters.
This is followed by lower case letters.
A character is always inserted to the left of the cursor.
Control the cursor.
Delete the character to the left of the cursor.
A A
Delete the last character (for user-generated text messages only, not
for entries in the telephone directory).
Note:
Characters cannot be deleted or added in the text messages
and advisory messages saved in the telephone system.