Marylin Schmidt's Smart Phone is a mechanic used in Five Nights at Candy's 2.

It allows the player to not only to light up the, otherwise mostly dark, Central Hall to see animatronics, but also to access the Robot Factory's camera system to monitor the animatronics and lure them around the factory by using the phones found in all rooms but the Central Hall itself.

If the player sees the Penguin or RAT on a camera, though, they need to swiftly put down the smart phone or change the camera or otherwise, the smart phone will crash and show a "SASS"-error, forcing it to reboot and leaving the protagonist vulnerable to all animatronics for a few seconds.