(For this article, I used an iPhone 11 running iOS 15.4.1.) On the main Background Sounds menu page, you can also adjust the volume of the white noise independently from other phone functions.

An all-black layout is especially sleek, although any color will work. Pastel colors are ideal for spring, but can be used all year round to give your iPhone ... a dimly-lit background, it creates ...

Apple calls this feature "Background Sound," but it functions just like you'd expect a white noise machine would. Here's how you can transform your iPhone into a pretty decent white noise machine.