Alternatively, alter the volume via the Control Center by swiping down from the top-right of your screen (iPhone X and later). There's also an option to limit the maximum volume. Go to Settings ...

Open the Settings app on your iPhone. Select the Sounds & Haptics ... but it is not actually dictated by a volume control. Instead, this feature is enabled by the technology behind Face ID.

A new rumor says that Apple has not forgotten the idea of solid-state buttons for the iPhone, but there are a number of ...