Please tell us some basic information before asking for help:
Model Name: ZE620KL
Firmware Version: V17.0615.2005.25
Rooted or not: not
Frequency of Occurrence: when on call
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.
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when i'm on call people always told me that they are hearing me badly ; this occure also before i upgraded to android 10. But when i switched to loud speaker i have no problem