Siemens hicom 150 H optiset E standard Operating Instructions Manual page 46

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Program/Service
More features?
*
48= Select language?
15=Spanish?
Changeover on?
Changeover off?
79
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Press the key. The LED lights up.
Confirm.
Confirm.
or
Enter the code.
Select the language you wish to use (such as "Spanish")
and press the "OK" dialog key to confirm.
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You can prevent unauthorized persons from using your
telephone and its electronic notebook during your ab-
sence.
Precondition: You must have configured a personal
identification number (PIN) for your telephone
(Æ page 47).
To lock and unlock the telephone:
Select and confirm.
or
or
or Enter the code for "on" or "off".