Handling in settings. Specific steps: 1. Open the Safari icon on your phone screen. 2. Enter the shortcut description in the search box and click on Options to get the shortcut. 3. Install the shortcut command on the phone screen and click to enter the shortcut command. 4. On the quick instructions page, click the Phone Speaker Dust Cleaning option. In this way, if the phone gets water, the sound waves will be clean. Sound waves in elastic media. As long as the longitudinal wave frequency excited by the wave source is between 20 and 20,000 Hz, it can cause human hearing. Vibrations within this frequency range are called acoustic vibrations, and longitudinal waves excited by acoustic vibrations are called sound waves. Sound waves travel in all directions with the help of various media. Generally, sound waves include longitudinal waves and transverse waves. The particles wherever the sound wave hits vibrate near the equilibrium position along the direction of propagation. The propagation of sound waves is essentially the transfer of energy in a medium.