If you turn off the “find smartphone/iPhone” button on grey, your phone will not ring when you press the button on your Filo, but you will still receive a notification on your phone screen. If you turn on this feature (making the "find smartphone/iPhone" button green (iOS) or red (Android)), your phone will ring every time that your press the button on your Filo (even if your phone is in silent mode). In iOS, if the music volume is at zero, your phone will not ring from Filo, and you will only receive a notification.