The Fifth Resident

When I was in the 6th grade, my family moved into Apartment 205.
Most of my memories from that time are happy ones-school, friends, cricket, computer games, and ordinary family life.
But one night, during a power outage, I saw something that I've never been able to explain.
Even now, years later, I still wonder who-or what-was holding that phone in the dark.
Based on a childhood experience.