WhatsApp for Asus Zenfone 9

WhatsApp calls run over the internet, so the Zenfone's built-in phone-app call recorder can't capture them, and Android blocks third-party apps from tapping into another app's call audio. The reliable workaround is to use the built-in Screen Recorder: swipe down twice to open Quick Settings, long-press the Screen Recorder tile to open its settings, and set the audio source to include System/Internal sound (plus Mic). Start the recording, then place the WhatsApp call on speakerphone so the microphone also picks up the other person. The exact audio-source options can vary by firmware version. See how others solved this on Reddit

The Zenfone 9 has well-documented earpiece-volume and call-clarity complaints, often made worse by a low in-call volume ceiling. During the WhatsApp call, press volume-up to maximum, then try toggling speakerphone on and off. Gently clean the top earpiece grille, which clogs easily on this compact phone. If it persists, open WhatsApp > Settings > Storage and data and make sure 'Use less data for calls' is OFF, since that lowers call audio quality, and check Settings > Sound & vibration & Do Not Disturb for any audio enhancement you can disable. See how others solved this on Reddit

Total silence on calls is usually audio routing getting stuck on a disconnected Bluetooth device or a stuck in-call audio service rather than a hardware fault. Open Settings > Connected devices > Bluetooth and forget any paired earbuds, then restart the phone and test a WhatsApp call on speaker. If it continues, clear WhatsApp's cache via Settings > Apps > WhatsApp > Storage & cache > Clear cache, and make sure WhatsApp has the Microphone permission under Settings > Apps > WhatsApp > Permissions. See how others solved this on Reddit

ASUS's aggressive battery management can freeze background apps, so WhatsApp never wakes to ring for incoming calls. Open Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then check Settings > Battery for any auto-launch or optimization limit and exempt WhatsApp. Also confirm Settings > Apps > WhatsApp > Notifications has Calls enabled with sound, and avoid aggressive battery-saver modes that re-restrict the app. See how others solved this on Reddit

The Zenfone 9's compact screen combined with the display-size setting can make floating chat-head bubbles and pop-up overlays render at the wrong scale. Lower the interface scale under Settings > Display > Display size and text > Display size, and reduce the font size in the same menu to keep overlays proportionate. If a specific overlay still misbehaves, toggle that app's 'Display over other apps' permission (Settings > Apps > [app] > Display over other apps) off and on to force it to redraw. See how others solved this on Reddit