WhatsApp for Xperia 10 IV

On your old Android phone, open WhatsApp and go to Settings > Chats > Chat backup, then tap Back up to Google Drive using the same Google account you'll sign into on the Xperia 10 IV. Install WhatsApp on the Xperia, verify the same phone number, and when prompted choose Restore to pull the backup down from Google Drive. Make sure both phones use the same Google account and that the Xperia is connected to Wi-Fi before restoring. See how others solved this on Reddit

WhatsApp's official iOS-to-Android transfer requires a USB-C to Lightning cable and the Android setup wizard: during the Xperia 10 IV's first-time setup (or after a factory reset), connect the iPhone with the cable, and when WhatsApp prompts you, scan the QR code to move chats and media directly. iCloud backups are not compatible with Android, so a Google Drive restore won't work coming from iPhone, and you must complete this during the guided setup step rather than after WhatsApp is already running. See how others solved this on Reddit

WhatsApp uses its own basic in-app camera rather than Sony's Photography Pro, so quality is lower by design and there's no setting to swap it. For better results, exit the WhatsApp camera, open the Sony camera app to take the shot, then attach it from the gallery using the paperclip/attachment icon in the chat. Also confirm WhatsApp has Camera permission under Settings > Apps > WhatsApp > Permissions so the in-app camera works at all. See how others solved this on Reddit

The cleanest way is WhatsApp's built-in multi-account feature: open WhatsApp, go to Settings, tap the dropdown arrow next to your name at the top, and choose Add account to register a second number (you'll need a second SIM or a number that can receive the verification code). The Xperia 10 IV has no system-level app cloner, so if the built-in option isn't available, install WhatsApp Business from the Play Store as a separate app for your second number. See how others solved this on Reddit

First update WhatsApp in the Play Store, then clear its cache via Settings > Apps > WhatsApp > Storage > Clear cache (avoid Clear storage, which deletes chats unless you've backed up). If it still crashes, check that battery optimization isn't killing it: go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, then reboot the phone. See how others solved this on Reddit

Confirm WhatsApp has Microphone permission under Settings > Apps > WhatsApp > Permissions > Microphone (set to Allow), and clean out the small mic hole near the USB-C port in case it's blocked by lint. If quality is still poor, update WhatsApp, and during recording keep the bottom of the phone clear of your hand; persistent low volume across all apps points to a hardware mic issue worth raising with Sony support. See how others solved this on Reddit