A Neat Trick

I read something interesting in a mystery novel recently.

A character was searching someone's apartment and he picked up the phone and pressed "redial" to see who was the last person the apartment's occupant had called. The character then commented that if you wanted to prevent someone from doing this to you, simply dial "O" and hang up as soon as it rings. Then, if anyone checks the redial feature, it would show that you dialed the operator.

Maybe Tiger should have read the same novel.