Calling Aunt Sarah

One day I found Morris,  my five-year-old son, with the telephone, which he quickly hung up when he saw me. 

"What were you doing?" I asked him.

"Calling Aunt Sarah."     

"How could you have called Aunt Sarah ?"  I asked. "You don't even know her number."     

"Yes, I do and I did call her," little Morris replied.

I wasted a lot of breath trying to convince him that he didn't know her number, but he insisted he had made
the call. "Okay," I said finally.  "What did she say, then, if you called her?"

"She told me I had the wrong number."