How to Fix Bluetooth Not Connecting on Xiaomi Phone

A Xiaomi phone microphone not working during calls is usually caused by blocked mic holes, call app permission errors, Bluetooth routing, noise reduction glitches, or a recent HyperOS update issue. The fastest fix is to clean the microphone area, disable Bluetooth, confirm microphone permission, restart the device, and test the mic in Recorder and speakerphone calls.

Steps

Check the microphone opening and case fit.

Remove the case, screen protector edge, or dust near the bottom microphone. A blocked hole is a common reason for Xiaomi mic not working during normal calls.
Test the microphone outside the Phone app.

Record a voice clip in Recorder and play it back. If Recorder works but calls do not, the problem is likely tied to call settings, permissions, or the dialer app.
Review app permission and call settings.

Open App permissions and confirm the Phone app has microphone access. If a third-party calling app is affected, re-enable microphone permission there as well.
Turn off Bluetooth and restart the phone.

A connected earbud, car kit, or watch can take over call audio input. Disable Bluetooth fully, restart the device, and place a test call again.
Update or reset relevant software settings.

Install the latest HyperOS or MIUI patch. If the microphone issue HyperOS started after an update, reset app preferences or clear Phone app cache and data.

Common Issues and Fixes

Issue	Likely Cause	Fix
Mic works in Recorder but not in calls	Phone app glitch or missing permission	Clear Phone app cache, confirm microphone access, and reboot.
Mic fails only with earbuds or car audio	Bluetooth input routing error	Disconnect accessories, forget the device, and test a direct cellular call.
Other side hears very low volume	Dirt in the bottom mic or top secondary mic	Clean mic holes gently with a soft brush or dry air.
Mic stopped after HyperOS update	Temporary software conflict	Install patches, reset app preferences, or test Safe mode.
Mic fails in all apps	Hardware fault or liquid damage	Run Xiaomi CIT hardware test and seek service if the test fails.

Quick Tips

Speakerphone behavior: Speakerphone may use a different microphone path. If speakerphone works but normal calls do not, focus on the primary bottom mic.
App conflicts: Some privacy or call recording apps can interrupt mic access. Disable recent utility apps and test again.
Safe mode testing: Safe mode helps isolate third-party app conflicts without deleting data.
Physical damage warning: If fix mic Xiaomi attempts fail after drops or moisture exposure, software fixes rarely solve the issue.

🤔Note:

If Recorder captures your voice clearly but callers still cannot hear you, the microphone hardware is usually fine. In that case, focus on Phone app permissions, Bluetooth routing, and dialer-related settings.

💡Protip:

Test both a normal call and a speakerphone call after each fix. This quickly shows whether the issue is tied to the primary bottom microphone or to software call routing.

Why does the Xiaomi microphone work in apps but not during calls?

The issue usually points to the Phone app, call permissions, Bluetooth routing, or a dialer bug rather than a full hardware failure. Testing Recorder helps confirm the difference.

Can HyperOS cause microphone problems on Xiaomi phones?

Yes. A microphone issue HyperOS can appear after updates due to permission resets, audio routing bugs, or app conflicts. A patch update, app reset, or Safe mode test often confirms the cause.

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