WhatsApp for Nord N10 5G

This is the proximity sensor turning the screen off as if the phone were held against your ear. Wipe the top of the screen near the earpiece and remove or trim any screen protector covering the sensor, since that is the most common cause. Then force-stop WhatsApp under Settings > Apps > WhatsApp, clear its cache via Storage usage > Clear cache (not Clear data), and test a call. If the screen still blanks during normal use, dial *#808# to open the engineering test menu and run the proximity sensor calibration, or back up and check for a software update under Settings > System > System updates. See how others solved this on Reddit

Start by clearing the app cache under Settings > Apps > WhatsApp > Storage usage > Clear cache (do NOT clear data, as that risks your chats), then update WhatsApp from the Google Play Store. Make sure battery optimization isn't killing it: go to Settings > Battery > Battery optimization, find WhatsApp, and set it to Don't optimize so OxygenOS doesn't freeze it in the background. See how others solved this on Reddit

OxygenOS aggressively restricts background apps, so first go to Settings > Apps > WhatsApp > Battery and choose Don't optimize / Allow background activity. Then open Settings > Apps > WhatsApp > Notifications and enable all categories plus lock-screen display, and under Settings > Notifications & status bar confirm WhatsApp is allowed to show on the lock screen. Locking WhatsApp in the Recent apps menu (tap the app icon > Lock) also helps prevent it from being closed. See how others solved this on Reddit

WhatsApp's built-in camera doesn't always map correctly to the Nord's sensor, so the quickest workaround is to tap the attach (paperclip) icon, choose Gallery, and use the stock Camera app instead, then share the result. Updating WhatsApp from the Play Store often resolves the framing bug; if it remains, clear WhatsApp's cache under Settings > Apps > WhatsApp > Storage usage. See how others solved this on Reddit

Since the Nord N10 5G is an Android phone, back up on your old device via WhatsApp > Settings > Chats > Chat backup to the same Google account, then sign in to WhatsApp on the Nord with the same phone number and Google account and tap Restore when prompted. Note that backups don't transfer between iPhone (iCloud) and Android (Google Drive) directly, so an iPhone-to-Nord move requires WhatsApp's official transfer tool or a cable using the Move to Android flow. See how others solved this on Reddit

If you have a Google Drive backup tied to your account, uninstall and reinstall WhatsApp from the Play Store, verify the same number, and tap Restore when prompted to pull back chats and media. Without a cloud backup, use a file manager to check Internal storage > Android > media > com.whatsapp > WhatsApp > Media, since local files may still exist even when the chat list looks empty; going forward, enable daily backups under WhatsApp > Settings > Chats > Chat backup. See how others solved this on Reddit