AT&T CL84109 - Reasons for Missing Caller ID Information; Unknown Caller

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Caller ID
Reasons for missing caller ID information
There are also occasions when other information or no information shows for
various reasons:
On-screen message Reason
PRIVATE NUMBER
The caller prefers not to show the phone number.
PRIVATE NAME
The caller prefers not to show the name.
PRIVATE CALLER
The caller prefers not to show the phone number
and name.
UNKNOWN NUMBER
Your telephone service provider cannot determine
the caller’s number.
UNKNOWN NAME
Your telephone service provider cannot determine
the caller’s name.
UNKNOWN CALLER
Your telephone service provider cannot determine
the caller’s name and telephone number. Calls from
other countries may also generate this message.