iPhone - Message Not Found from Unknown

Anyone got the same thing?   Receiving texts from Unknown - Message not Found.  When tried to call the number is "865-66;6"  
Does anyone know the source and how they got through?
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darbid73Connect With a Mentor Commented:
Hi Tiras25,

I am not sure there is a known answer to your "Unknown" issue.  I think however it is pretty common.

Some people say it is iMessage: Do you use iMessage and have you activated it properly.  

Some people say it is a message that the phone failed to receive properly: Do you still get lots of messages from people and have people told you that they have sent you a message that you have not received.

See here.
See for example here.

In case you are bored here is some more to read.
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