When WhatsApp video calls fail to provide sound, it can be frustrating for users on either iPhone or Android devices. Fortunately, there are several fixes that you can try to resolve this issue. Here are 9 best fixes for no sound during WhatsApp video calls on both iPhone and Android:

1. Check the Volume Level: Ensure your device’s volume is not muted or set too low. Use the physical volume buttons on your device to adjust the sound level during the call.

2. Restart Your Device: Sometimes, a simple restart can fix minor software glitches which could be causing the sound issues on WhatsApp calls.

3. Update WhatsApp: Make sure you are using the latest version of WhatsApp. Go to the App Store on iPhone or Google Play Store on Android and update if there is a newer version available.

4. Check App Permissions: Go to your phone settings and ensure WhatsApp has permission to access the microphone. Without this permission, your voice won’t be transmitted during a call.

5. Disable Bluetooth: If Bluetooth is enabled, your phone might be trying to send sound to a paired device. Turn off Bluetooth and try calling again.

6. Clear Cache (Android Only): On Android devices, go to Settings > Apps > WhatsApp > Storage and then tap ‘Clear Cache’. This can help refresh the app’s operations.

7. Check Network Connection: A poor or unstable internet connection can affect call quality, including sound. Ensure you have a strong and stable connection when making WhatsApp video calls.

8. Disable Do Not Disturb Mode: If ‘Do Not Disturb’ mode is active on your phone, it might silence incoming call notifications or sounds. Deactivate it during your calls.

9. Reinstall WhatsApp: If all else fails, uninstalling and reinstalling WhatsApp can sometimes fix lingering issues. Just make sure to back up your chats before doing so.

If after trying these steps you still experience problems with sound on your WhatsApp video calls, consider reaching out to WhatsApp support for further assistance or consult with your phone manufacturer’s help sources for advanced troubleshooting.