The short answer
Pocket lint compacted into the speaker grille is the most common cause, and dry brushing usually restores full volume. Check the case is not covering the speaker, and if the phone has been near water, it may be in a protective mode that reduces output until it dries. Never poke anything metal into a speaker grille.
Phone speakers are tiny and sit behind a fine mesh designed to keep dust out. That mesh does its job until it is full, at which point the sound has to fight through a felted layer of pocket debris. Volume drops, high frequencies disappear first, and people conclude the speaker has failed.
Cause 1: a blocked grille
Look at the grille with a light and magnification
A phone camera in macro mode works. What looks like an empty slot is usually packed.
Brush gently with a soft dry brush
A clean, soft toothbrush is ideal. Brush along the grille with the phone facing downwards so debris falls out rather than in.
Lift stubborn material with putty
Blu-tack or similar, pressed lightly onto the grille and peeled away. This lifts compacted lint that brushing cannot shift.
Use a wooden toothpick around the edges only
Never metal, and never pushing inward. The mesh tears easily and there is no repair for that short of replacing the assembly.
Test after each step
Play something with a wide frequency range. Improvement is usually immediate and obvious.
Do not use compressed air on a phone speaker, and do not use liquid. Compressed air can force debris through the mesh into the driver, and liquid pushes it deeper and can damage the speaker directly. Dry brushing is slower and does not create a worse problem.
Cause 2: the case
Cases are a surprisingly common cause. A thick case with a shallow cutout, a case fitted slightly off, or a folio cover that sits over the speaker all attenuate the sound. Take the case off entirely and compare. If the difference is significant, the case is the problem and a different one solves it.
Screen protectors matter too on phones where the earpiece speaker doubles as a stereo channel: a protector covering the earpiece slot muffles calls and media equally.
Cause 3: water protection mode
Water-resistant phones detect moisture and reduce or disable speaker output to protect the driver, sometimes without telling you clearly. Some phones offer a water ejection function that plays a low tone to push water out of the speaker. If yours does, use it. Otherwise leave the phone somewhere warm and dry, not in direct heat, for a day.
Charging while a port is wet is worth avoiding for the same reason, and most phones will warn about it.
Cause 4: software
- Volume limits. Many phones have a separate media volume cap for hearing protection, sometimes enabled automatically after loud listening.
- Equaliser settings in the system sound settings or in a particular app.
- Accessibility audio options such as mono audio or balance sliders set to one side.
- Audio still routed to Bluetooth, which produces quiet, thin playback through the phone if the routing is confused. Turn Bluetooth off as a test.
- Do Not Disturb or a Focus mode affecting some audio paths.
Restarting the phone resolves a surprising number of these, because a stuck audio routing state survives closing apps but not a reboot.
Test in safe mode on Android, which loads no third-party apps. If the volume is normal there, an app is affecting audio, and a recently installed sound enhancer or equaliser app is the usual suspect.
Cause 5: only in calls, or only in media
Phones have at least two speakers: the earpiece for calls and a louder one at the bottom for media, with both used together for stereo on many models. Which one is affected narrows the cause considerably:
- Quiet in calls only: the earpiece slot is blocked, or a screen protector covers it.
- Quiet in media only: the bottom speaker, most exposed to pocket debris.
- Sound clearly coming from one side: one of a stereo pair is blocked or failed.
- Quiet everywhere: more likely software, a volume cap or water protection.
When it is the speaker
If cleaning, removing the case, restarting and checking settings all fail, and the sound is distorted as well as quiet, the driver has probably failed. Speakers are usually a modular part and the repair is inexpensive compared with the phone.
Before paying, try one more thing: many phones have a hardware diagnostic accessible through the manufacturer’s support app, which plays test tones through each speaker individually. That gives you a clear answer and something concrete to tell the repair shop.
Can I clean my phone speaker with a cotton bud?
Around the outside, yes. Do not push one into the grille, since it compacts debris and leaves fibres. A dry soft brush and putty are more effective and safer.
Why is my phone quiet after being near water?
Water-resistant phones reduce speaker output when they detect moisture, to protect the driver. Use the water ejection feature if your phone has one, and leave it to dry for a day.
Will a louder volume app help?
Volume booster apps push the signal beyond the intended limit, which distorts the sound and can damage a small speaker. If the speaker is blocked, cleaning it restores far more volume than any app can add.
Why do calls sound fine but music is quiet?
Those use different speakers. Music uses the main bottom speaker, which is the one most exposed to pocket lint, so it is usually the one that blocks first.
Is a speaker replacement expensive?
Usually one of the cheaper phone repairs, since the speaker is a modular part on most models. Get a quote before assuming the phone needs replacing.
The order
Take the case off, then brush the grille dry and lift the lint with putty. Restart the phone and check volume limits, equalisers and accessibility settings. Rule out water protection mode if the phone has been damp. Work out whether it is the earpiece or the main speaker, since that narrows it immediately. Only then consider a repair, with the manufacturer’s speaker test as evidence.
