The burner phones Heuermann used to contact his victims always pinged off the same cell towers as his legitimate cell phone, indicating that while he was using the burner phones, he was also in possession of his personal cell at the same time. The burner phones also pinged off cell towers close to his office in Midtown Manhattan and close to his family home in Massachusetts Park. His personal cell phone and the burner phones were in the same locations at the same time that corresponded with the disappearance and the murders of the victims.