meaning for the handset symbols on the phone page


    What are the handset symbols and the little red arrows and their meaning on the Phone page.  It show the phone number you either called or the phone number that called you.  Then underneath that is a small telephone handset symbol with various red arrows.  I can find nothing anywhere that defines what these mean - incoming call answered, incoming call not answered, outgoing call answered, outgoing call unanswered.  I think I know what they mean - but need confirmation.  I have a Samsung Galaxy S-7 on a T-mobile account.

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