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First rule out muted volume, Bluetooth or accessory routing, and anything covering the speaker openings. Then compare more than one app and audio source, clean only as the phone maker directs, and restart the phone. If crackling or low volume persists across sources—or a built-in diagnostic reports a fault—contact the manufacturer or a qualified repair provider. The right steps vary by phone model, so do not assume every speaker grille or setting works the same way.
Find out whether the problem is the speaker or one source
Test music or a video, notifications, and—if relevant—calls and speakerphone. Try more than one app. If headphones are available, compare their sound with playback from the phone itself. Note when the problem began: after a case change, water exposure, a new app, or a change in surroundings. These clues help narrow the cause without assuming the speaker has failed.
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- Only one app sounds wrong: Update or troubleshoot that app before treating the phone speaker as damaged.
- Only calls crackle: Check reception and try another location. Apple notes that call static or crackling can come from the network or reception rather than the speaker (Apple’s iPhone speaker guidance).
- Every source sounds quiet or distorted: Continue with the phone’s volume, routing, openings, and software checks below.
Check volume, mute settings, and audio routing
Raise the relevant media or call volume while that type of audio is playing, and make sure the phone is not muted. Temporarily turn Bluetooth off and disconnect wired or USB audio accessories; sound may be playing through another device. Remove the case or film if it could cover a speaker opening. Menu labels vary by model and software version, so use the manufacturer’s current instructions rather than assuming a universal path.
- iPhone: Check Silent mode and Focus or Do Not Disturb. Apple also suggests testing the Ringtone and Alerts slider; a dimmed speaker control or sound trouble that continues may require service (Apple Support).
- Samsung Galaxy: Check volume while audio is playing and confirm Bluetooth is not redirecting sound. Samsung identifies blocked openings, redirected audio, software glitches, and physical damage as possible causes (Samsung UK support).
Inspect and clean the speaker opening safely
Look for visible lint or an obstruction, but do not insert anything into the grille. If the maker’s instructions recommend cleaning, follow them exactly. Apple advises using a small, clean, dry, soft-bristled brush; Samsung UK suggests gently brushing with a dry toothbrush. This can address an external obstruction, but it will not repair a damaged speaker or resolve a software, network, or moisture problem.
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Do not use pins, toothpicks, swabs, or liquid in the openings, and do not blast them with compressed air. Samsung warns that canned compressed air may damage the device (Samsung US speaker guidance).
If the phone got wet, follow its liquid-care guidance
Water in a speaker can temporarily affect sound. Samsung advises patting the earpiece, speaker, microphone, and USB port with a clean, soft cloth; for salt-water exposure, its guidance says to rinse with fresh water and dry thoroughly. It also warns against canned compressed air for cleaning or drying (Samsung US).
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Follow the instructions for your exact model and exposure. Water resistance and care guidance differ by device; water resistance does not guarantee that sound will return to normal immediately or establish whether liquid damage is covered by warranty.
Restart the phone and check for app or software trouble
- Restart the phone, then test the same audio sources again.
- Install available system updates and check whether the sound changes.
- If the problem began after installing an app, investigate that app. On Samsung phones, Safe mode disables downloaded apps; if the sound issue disappears in Safe mode, a downloaded app is a likely cause. Samsung explains the option in its speaker troubleshooting guide.
- Do not jump to a factory reset. Samsung presents it as a later option and warns that it erases personal data and settings; back up first if you decide to proceed.
Check for circumstances specific to the phone model
Samsung says a large change in ambient air pressure can make Galaxy speakers sound quiet, crackly, or distorted, and that pressure generally equalizes over time. Its US guidance suggests temporarily sliding the SIM tray partway out to speed equalization. That is Samsung-specific advice, not a general phone fix: check the instructions for your exact model and never force the tray (Samsung US).
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Samsung Members also offers device diagnostics. On iPhone, Apple recommends testing the Ringtone and Alerts slider as part of checking sound. Use only tests and menu paths supported for your model and software version; names and availability can differ.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When to contact support or arrange repair
Contact the phone maker or a qualified repair provider if sound remains distorted across apps and sources, the manufacturer’s diagnostic flags a fault, or the phone may have physical or liquid damage. Persistent sound trouble may need service, according to Apple; Samsung also directs users with unresolved issues to support or repair (Samsung UK).
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Without the exact model and evidence of a hardware fault, there is no sound basis for recommending a specific replacement part or a do-it-yourself opening procedure. Check warranty terms and model-specific repair guidance before authorizing service.
Quick Recap
Best Value
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