I once played phone tag with a heartbroken stranger. She had the wrong number. She'd call late at night while I was sleeping, I'd miss the call, and she'd be greeted by the grandmotherly voice of AT&T's Pat Fleet, who I let be my generic voicemail message. The woman would leave long messages. I'd try to call back, only to encounter an endless series of rings, never to be picked up. This continued for three weeks. I briefly wondered if she was a ghost.