The new iPhone XS has 3 physical buttons and 1 switch to ensure maximum accessibility to its users. The buttons and the switches are

• Volume Up (+) button
• Volume down (-) button
• Ringer Switch
• Power Button

The newer iPhone models have discontinued the Home button, which used to serve both the purpose of a home button and a fingerprint sensor. Apple has discontinued Home Buttons since the iPhone X models and has continued on the same policy till now. The iPhone XS has no home button. Instead, it has a Face ID or a face unlock feature. Now, with time, the buttons of your iPhone XS may face wear and tear and may cease to function properly. The most common issues faced regarding the buttons of smartphones are...

• The sound doesn’t increase/decrease when I press the volume up or down key.
• The buttons are stuck and can’t be pressed.
• The switch doesn’t work/automatically switches between ringer and silent mode.

These are the most common issues regarding the physical buttons in the iPhone. However, Apple recommends restarting the device and updating the iOS in this case. And if it still does not fix the issues, it needs to be looked at by professionals. iPhone recommends using AssistiveTouch for the longevity of the physical buttons of the iPhone XS.