Work through hardware causes before software ones. Debris in the grille and water in the chamber account for most muffled speakers, and both are fixable in minutes.
Step one: rule out software
Before opening anything, check that the phone is not simply routing audio elsewhere. Bluetooth devices in range reconnect silently, and a phone playing through a car system two rooms away sounds exactly like a dead speaker.
- Turn Bluetooth off entirely and test again.
- Check that Do Not Disturb or a silent profile is not active.
- Test in more than one app. A single app with its own volume control can be the whole problem.
- Restart the phone. This clears audio routing faults that survive app switching.
Step two: clear the grille
Pocket lint compacts into speaker mesh and is the most common physical cause. Use a soft dry toothbrush, brushing across the grille rather than into it. A wooden toothpick will lift compacted material out of the corners.
Do not use compressed air. It pushes debris further in and the pressure can damage the speaker membrane. Do not use anything metal, which tears the mesh.
Step three: shift trapped water
If the phone has been wet, water sits in the speaker chamber and damps the membrane. Playing a sustained low frequency tone with the speaker facing downward vibrates it out. Several apps and web pages generate these tones, and most phones with water resistance ratings have a built-in eject function in settings.
Give it a few cycles and leave the phone port-down for an hour afterwards. Rice does nothing useful. A hair dryer is actively harmful, since heat drives moisture deeper and can deform adhesive.
Step four: check for a case problem
Thick cases and screen protectors misaligned over the earpiece are a surprisingly frequent cause. Remove the case entirely and test. If the sound is fine without it, the case is blocking or redirecting output and no amount of cleaning will help.
When it is genuinely the hardware
If sound is distorted at all volumes, crackles on bass, or cuts out when the phone flexes slightly, the speaker or its connector has failed. That is a repair rather than a fix. Before booking one, run the phone’s built-in hardware diagnostic if it has one, because a logged fault makes the repair conversation considerably shorter.
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