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Answer to: Why is the mic weak when I talk on speaker? (Whatsapp only)Prior to the 6S, the speakerphone microphone in normal (not Whatsapp) calls is the one in the earpiece grille attached to the proximity sensor. Starting with the 6S, they started using the redundant in-call mics by the charge port to complement the top mic. Which microphones Whatsapp chooses to use is unknown to me as I don't use it on customer devices. Make sure you don't have any debris blocking the holes at the bottom flanking the charge port. Barring liquid damage, I'd be surprised to see either the earpiece microphone or the charge port microphones to "go bad" at this age. If your issue is a hardware one, your top suspects are the charge port flex or the sensor (AKA front camera, proximity sensor) flex since they contain the bulk of your microphones.