Ericsson businessphone 250 User Manual page 68

Security
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Clear
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Select password
You can use your four-digit password for blocking your phone
from unauthorized use, or for making external calls from any
blocked extension.
Dial to select a new password
Dial your present password
The default password is "0000".
*
Press
Dial your new password
#
Press
Verification tone.
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Press to finish the procedure
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BusinessPhone - Operator´s Console