Does your smartphone have with "noise suppression/noise reduction" feature. check it (Settings > Call Settings >Noise Reduction option). You may solve the question by disabling it. Try it. If not, perhaps, third-party app might be the cause..check for recently installed suspicious third-party apps
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Does your smartphone have with "noise suppression/noise reduction" feature. check it (Settings > Call Settings >Noise Reduction option). You may solve the question by disabling it. Try it. If not, perhaps, third-party app might be the cause..check for recently installed suspicious third-party apps