WhatsApp for Xperia 5 V

First confirm it isn't hardware: record a clip in the Sony Recorder app and play it back. If that sounds fine, the problem is app-side. Revoke and re-grant the mic permission under Settings > Apps > WhatsApp > Permissions > Microphone, then force-stop and reopen WhatsApp. Set WhatsApp to Unrestricted under Settings > Apps > WhatsApp > App battery usage so Sony's power management doesn't throttle background audio, and make sure no case or screen protector covers the bottom microphone. Updating WhatsApp from the Play Store also clears known mic-processing bugs. See how others solved this on Reddit

This is usually a stuck audio route caused by another app or a Bluetooth device grabbing the microphone. Close background apps that use audio, disconnect paired earbuds, and retry the call. Confirm WhatsApp has mic access at Settings > Apps > WhatsApp > Permissions > Microphone, and on that same Permissions screen turn off "Pause app activity if unused" so Android doesn't reset the permission. Rebooting the phone reliably clears the silent-mic state mid-call until WhatsApp ships a fix. See how others solved this on Reddit

WhatsApp now supports two accounts natively, so you no longer need cloning tricks. Open WhatsApp, tap the three-dot menu > Settings, tap the small arrow next to your name at the top, and choose Add account. You'll register a second phone number (a second SIM is convenient but any number that can receive the verification code works). Switch between accounts from that same arrow. The native option is the most reliable since cloned or dual-app copies often break after WhatsApp updates. See how others solved this on Reddit

WhatsApp's built-in camera bypasses Sony's image processing and applies heavy compression, so it will never match the stock app. Instead, shoot with the Sony Camera app, then attach the saved photo in chat via the paperclip > Gallery. To reduce the compression WhatsApp adds when sending, set Settings > Storage and data > Media upload quality to HD. For zero quality loss, send the image as a document (paperclip > Document) instead of a photo. See how others solved this on Reddit

Update WhatsApp in the Play Store first, then clear its cache at Settings > Apps > WhatsApp > Storage > Clear cache (do not tap Clear storage, which logs you out and wipes local data). If it still crashes, set the app to Unrestricted under Settings > Apps > WhatsApp > App battery usage so Sony's aggressive power management isn't killing it, and reboot. As a last resort, back up chats to Google Drive, then uninstall and reinstall. See how others solved this on Reddit

WhatsApp can't route call audio if it's missing permissions, so open Settings > Apps > WhatsApp > Permissions and make sure both Phone and Nearby devices are allowed. Re-pair the headset under Settings > Device connection > Bluetooth and set it as the active output. Sony's STAMINA / battery optimization can also block the headset's answer button, so set WhatsApp to Unrestricted under App battery usage. If the headset button still won't answer, accept the call on the phone screen and then switch audio to the headset from the in-call controls. See how others solved this on Reddit