A little story for you:
I lived in the Student's Hostel for roughly two years. a large building with one telephone in the entrance and when it rang anyone who was closest answered the phone.
This evening i answered the phone and a female voice asked to speak to Mr X. I ran up to his room banged on the door but he clearly was not in.
Returning to the telephone booth, I was about to speak when the female voice said " Darling, panic over, my period came this morning."
I answered, "Oh! that is good news, I will tell Mr X when he comes in, as he is out at the moment.
The telephone went dead.