Final answer:
The cell phone network is able to identify the number and location of the phone from which a caller is calling 911 by triangulating the signals from nearby cell towers.
Step-by-step explanation:
The communication system that is able to identify the number and location of the phone from which a caller is calling 911 is the cell phone network. When a call is made to 911, the cell phone network uses the technology of cellular towers to determine the location of the caller. The network triangulates the signals from nearby cell towers to pinpoint the caller's location. This information is then transmitted to the emergency services, enabling them to respond to the emergency effectively.