Symptoms
- Caller can't hear you while wearing a Bluetooth headset
- Headset audio plays fine but your voice doesn't transmit
- Issue started after a software update
- Mic works with one phone but not another
Likely causes
- CommonPhone using a different audio input than the headsetEven when paired, some phones default the mic input to the phone itself.
- CommonLow headset batteryMany Bluetooth headsets cut mic function first as battery gets critically low.
- PossibleOutdated Bluetooth headset firmwareManufacturer updates often fix call audio bugs.
- PossibleDebris blocking the headset's microphone openingDust or moisture can muffle or block the mic pickup.
- Less commonInternal microphone hardware faultA worn or damaged mic component won't work regardless of settings.
What to do
- During a call, check the phone's audio source menu and manually select the Bluetooth headset if it isn't already chosen.
- Charge the headset fully and test again, since low battery can disable the mic before other functions.
- Turn Bluetooth off and back on, or forget and re-pair the headset with the phone.
- Check the manufacturer's app for a firmware update for the headset.
- Inspect the headset's mic opening for debris and clean gently with a dry brush.
- Test the headset paired with a different phone or laptop to see if the mic works there.
- Restart the phone to clear any stuck Bluetooth audio session.
- If the mic still fails on multiple devices after these steps, the headset's mic hardware likely needs service or replacement.
Tools and parts
- Soft-bristled brush
Replacement Bluetooth headsetSearch: “bluetooth headset with microphone”
When to call a pro
If the mic fails across multiple paired devices after charging and updating firmware, the headset likely needs professional repair or replacement.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.