Wrong Number

When I was a teenager, a group of us went to Liskeard in Cornwall for our first holiday together without our parents. Whilst out visiting the local beauty spots, we walked beside a public telephone box and could hear the phone was ringing. First of all we just laughed and ignored it but on passing, I felt the sudden urge to go back and answer it. I picked up the phone and somebody said "Is that you Carol"? Well I was stunned but I answered yes. It was my aunt on the end of the phone who was trying to contact my father to advise him there had been a death in the family. I have puzzled over this all of my life. My family lived in Wallington, Surrey and my aunt lived in Sutton, Surrey. How did that call get through to a public phone box in Cornwall just as I was walking by?