If it hadn't been a total myth.
She said that a young man in her stake had received his mission call recently and when he opened the envelope, he found a single sheet of paper containing a phone number. He dialed the number and anxiously waited as friends and family looked on.
Finally the voice of an operator came on the line and said, "Please hold for President Hinckley."
Next, the astonished young man heard the prophet's voice.