Ericsson DT288 User Manual page 50

SECURITY
SELECT
PASSWORD
48
You can use your four-digit password for blocking your
phone from unauthorized use or for making external calls
from any blocked extension.
Press
Dial to select a new password
Dial your present password
Press
The default password is "0000"
Dial your new password
Press
Verification tone.
BusinessPhone 250 - Portable DT288
BusinessPhone 50 - Portable DT288