The word Hello became popular after Thomas Edison suggested its use when answering the phone. Alexander Graham Bell, his competitor, preferred Ahoy.
In 1932, a Seattle phone repair guy received an unusual complaint from a customer. A woman claimed that her phone never rang, however her dog howled on a backyard to let her know to pick up the phone on time. Turned out that, the dog didn’t have a psychic power. Instead, the dog was chained to the ground wire and there was a short circuit. Apparently, the dog was shocked every time his owner’s number was called.