Choose a phone speaker test by symptom
Start with the cause you already know. After a splash, follow the drying guidance before using a water eject sound. If the grille is dry but visibly dusty, use the speaker cleaner cautiously. When the cause is unclear, run the iPhone and phone speaker test to compare rattle, frequency response, and general clarity.
Before you play any cleaning sound
Remove the case, disconnect headphones and Bluetooth outputs, and begin at a low volume. Never insert a pin or other hard object into the speaker mesh. If the phone may contain liquid, unplug it and do not charge it until it is dry according to the manufacturer's instructions. A browser tone may help move a small droplet near a grille, but it cannot reverse corrosion, replace professional repair, or make a phone waterproof.
How to compare the result
Use the same volume before and after each attempt. Listen to spoken audio as well as a controlled test tone. Improvement after drying or clearing the grille suggests a local obstruction; unchanged buzzing, a silent speaker, or distortion at moderate volume can indicate a software routing issue or physical damage. Restart the phone and confirm its sound settings before arranging service.