WhatsApp for Samsung

One UI's aggressive battery optimization is the usual culprit, so go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted. Then open Settings > Battery > Background usage limits and make sure WhatsApp is removed from both the Sleeping and Deep sleeping app lists, and confirm notifications are fully enabled in WhatsApp's own Settings > Notifications. See how others solved this on Reddit

Open Settings > Apps > WhatsApp > Notifications and make sure notifications (and each category like Messages and Group notifications) are turned on. Then go to Settings > Battery > Background usage limits and remove WhatsApp from the "Sleeping apps" and "Deep sleeping apps" lists so it isn't suspended. Finally, in Settings > Apps > WhatsApp > Battery, set it to "Unrestricted." Aggressive power management on One UI is the most common cause of silent or vanished WhatsApp notifications. See how others solved this on Reddit

One UI doesn't let arbitrary apps run on the cover (FlexWindow) screen by default, so install Samsung's free 'Good Lock' app from the Galaxy Store, open its 'MultiStar' module, and turn on the cover-screen apps feature (often shown as 'I love Galaxy Foldable' / 'Launch widget'). Then add WhatsApp to the cover screen's Apps widget: long-press the cover screen, add the Apps widget, edit it, and tick WhatsApp. After that a tap on the cover launches the full app on the outer display. Without Good Lock there is no stock toggle to allow WhatsApp on the cover screen. See how others solved this on Reddit

WhatsApp sometimes opens in a phone-shaped column on the wide inner screen instead of filling it. Go to Settings > Display > Full screen apps and make sure WhatsApp is toggled on so it's allowed to use the full aspect ratio, then fully close the app (swipe it away in Recents) and reopen it. Make sure WhatsApp is updated to the latest version from the Play Store, since older builds handled the foldable's wide screen poorly. If it still won't expand, restarting the phone after enabling the toggle forces the app to redraw at the correct size. See how others solved this on Reddit

This was a confirmed bug where WhatsApp's restore failed on the S25 series during setup. The reliable workaround is to skip the restore prompt initially, finish setting up and verifying your number in WhatsApp, then go to WhatsApp Settings > Chats > Chat backup and trigger the restore manually, making sure you're signed into the same Google account that holds the backup. Confirm under Settings > Google > Backup that a Google Drive backup exists, stay on Wi-Fi, and update WhatsApp from the Play Store first since newer versions patched the original failure. See how others solved this on Reddit

This usually clears up by forcing a fresh start: go to Settings > Apps > WhatsApp > Storage, tap Clear cache (not Clear data, which would wipe your local chats), then reboot the phone. If it still hangs, make sure WhatsApp is updated to the latest version in the Play Store and that battery optimization isn't killing it under Settings > Apps > WhatsApp > Battery > set to Unrestricted. As a last resort, uninstall and reinstall WhatsApp and let it restore your chat history from Google Drive during setup. See how others solved this on Reddit

Stock One UI 8 only lets a limited set of apps run on the cover (Flex) screen, and WhatsApp isn't included by default. To force-enable it, install Samsung's Good Lock from the Galaxy Store, open the MultiStar module, and turn on the cover-screen / 'I love Galaxy Foldable' launcher option that lets you add any installed app. After that, swipe to the apps panel on the closed cover screen and WhatsApp will launch there. There is no native 'Labs' or Settings toggle that whitelists WhatsApp on the cover screen, so Good Lock is the reliable route. See how others solved this on Reddit

WhatsApp uses its own in-app camera that doesn't fully match the S24 Plus's front sensor field of view, so it crops into the center of the frame for selfies and video calls. First make sure WhatsApp is updated to the latest version from the Play Store, as framing bugs are often fixed in updates. If it's still zoomed, the reliable workaround is to take the photo with the regular Samsung Camera app and attach it from your gallery instead of using WhatsApp's built-in camera. For video calls, holding the phone slightly farther away is currently the only way to fit more of your face in frame. See how others solved this on Reddit

First update WhatsApp through the Google Play Store, then clear its cache via Settings > Apps > WhatsApp > Storage > Clear cache (avoid Clear data, which can wipe chats that aren't backed up). If it still misbehaves, exempt WhatsApp from One UI's power management: go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted, and make sure WhatsApp isn't listed under Settings > Battery > Background usage limits > Sleeping apps so syncing and notifications aren't throttled. See how others solved this on Reddit

Open Settings, tap Advanced features, then Dual Messenger, and toggle WhatsApp on. One UI installs a second WhatsApp icon (marked with a small badge) so you can register a separate number, and during setup it asks whether the second app should use a separate contact list. This is built into One UI, so you don't need any third-party cloning app from the Play Store. See how others solved this on Reddit