The phone is a phone and an important part of Facade's plot. As the name implies, it is in fact a phone. It will ring during the beginning of the game either by Trip's parents or Grace's father.
The player can answer the phone which will cause Grace and Trip to react and the caller in question to act confused, however it is impossible to actually have a conversation with the caller as they all simply believe to have dialed the wrong number.
- Spamming the voice mail seems to be the only thing that does not annoy Trip or Grace
- The phone plays an central role in acheiving the secret ending of the game