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Caller ID
Caller ID operation
There are also occasions when other information
or no information shows for various reasons:
On-screen
message
PRIVATE
CALLER
PRIVATE
NAME
PRIVATE
NUMBER
UNKNOWN
CALLER
UNKNOWN
NAME
UNKNOWN
NUMBER
51
Reason
Caller's name and telephone
number are not revealed at
caller's request.
The caller's name has been set
as private.
The caller's number has been set
as private.
Your local telephone company is
unable to determine the caller's
name and telephone number.
Calls from other countries may
also generate this message.
Your local telephone company is
unable to determine the caller's
name.
Your local telephone company is
unable to determine the caller's
number.
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