If you ever misplace your mobile phone nearby, you can always call yourself and follow the ringing. But what if the phone is on silent? Apartment Therapy notes this neat trick that might help: call the phone, then walk around your house with music playing.
The speakers on your music player (or speakers with long cords) may pick up the buzzing interference that happens when your mobile phone communicates to the mobile phone tower. Getting closer to your phone, you should hear louder and more interference so you can track down that silent phone's location.
And for those times when your phone isn't on silent, a white noise ringtone can make it easier to find.
How to Find Your Phone When It's on Silent [Apartment Therapy]