No, a "no caller ID" or "unknown caller" message indicates that the caller's phone number is not being sent to your phone. It does not necessarily imply that the caller is one of your connections. A telemarketer, a con artist, or someone attempting to remain anonymous could be the source of the call. When a call comes in from a number that is not in the recipient's contact list in the UK, it usually appears as "Unknown Caller" or "No Caller ID".
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