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Here are some possible causes and solutions when the other party can't hear your voice clearly:
1. Check if the phone's leather case is blocking the MIC. Remove the case and test the microphone again while gaming;
2. Check whether the MIC hole is dirty. You can try to wipe it gently with a dust-free cloth to remove it;
3. When playing games, if the phone is in landscape mode (horizontal orientation), the microphone hole can be covered by your hand or the phone's frame, leading to inconsistent sound levels.
Does it help?