With voice calls taking a back burner, how much effort do you put into setting up a custom ringtone on your smartphone?

Open your iPhone’s Settings and tap Sounds & Haptics to assign your ringtones. Scroll down the menu to SOUNDS AND VIBRATION ...

The Center for Biological Diversity offers you free endangered species ringtones and phone wallpapers — a collection of high-quality, authentic sounds and images of some of the world’s most threatened ...

But because so many people use iPhones without bothering to change their ringtones, you end up reacting any time someone's ...