Your voice works fine on normal phone calls, but on WhatsApp calls the other person hears nothing — or only a very faint voice. This is one of the most common WhatsApp problems, and it is usually a permission or settings issue, not a broken microphone.
First, check the microphone permission. Go to Settings > Apps > WhatsApp > Permissions and make sure "Microphone" is set to "Allow" or "Allow only while using the app". If it is set to "Don't allow", WhatsApp simply cannot hear you. While you are there, also allow the permission again after any app update, because updates sometimes reset permissions.
Second, test your microphone in another app. Open the voice recorder and record a few seconds. If the recording is clear, your mic hardware is fine and the problem is inside WhatsApp. If the recording is also silent, the mic hole may be blocked by dust or a phone case — clean the small mic hole gently with a soft brush and remove the case to test.
Third, clear WhatsApp's cache. Go to Settings > Apps > WhatsApp > Storage and tap "Clear cache" (do NOT tap "Clear data" — that deletes your chats). Then restart your phone and try a WhatsApp call again.
Also check that no Bluetooth earphone is connected. If your phone is connected to a Bluetooth device, WhatsApp may be sending your voice to the earphone's mic instead of the phone's mic. Turn Bluetooth off and test again.
If the mic fails in every app, the microphone itself may be faulty or its flex cable loose. A technician can test and replace it quickly — do not try to open the phone yourself.
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