Siemens Hicom 150 H Operating Instructions Manual page 24

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To prevent unauthorized persons from using your tele-
phone Æ page 23 and to use another telephone like
your own Æ page 29, you need to enter a personal iden-
tification number, which you can save yourself.
Lift the handset.
Enter the code.
Enter the current five-digit PIN.
If you have not yet assigned a PIN, use the PIN "00000"
the first time you enter it.
Enter the new PIN.
Repeat the new PIN.
If you forget your PIN, contact System Support,
who can reset your PIN to "00000".
An authorized party Æ page 32 can also lock and
unlock your telephone.