WhatsApp for Samsung Galaxy S20

One UI's battery optimization often puts WhatsApp to sleep in the background, which stops incoming-call alerts. Go to Settings > Apps > WhatsApp > Battery and set it to Unrestricted. Then open Settings > Apps > WhatsApp > Notifications and make sure the Calls category is on with sound and pop-up enabled. Finally, open Settings > Battery and device care > Battery > Background usage limits and remove WhatsApp from 'Sleeping apps' and 'Deep sleeping apps' so it's never auto-slept. See how others solved this on Reddit

Dual Messenger installs a second cloned WhatsApp, but it often breaks notifications and media access if the clone's permissions aren't set. Go to Settings > Advanced features > Dual Messenger, toggle WhatsApp off, restart the phone, then toggle it back on. The cloned app is separate, so grant it its own notification, storage, and microphone permissions under Settings > Apps (find the duplicated WhatsApp with the chain/badge icon) > Permissions, since it does not inherit them from the original install. See how others solved this on Reddit

Give WhatsApp its own distinct sound so you can recognize it instantly. In WhatsApp go to Settings > Notifications and set unique tones for Messages, Groups, and Calls. You can also fine-tune each category in Samsung's Settings > Apps > WhatsApp > Notifications, where every notification channel has its own sound and vibration. Picking a tone that's clearly different from your default phone ringtone and SMS sound (Settings > Sounds and vibration) makes them easy to distinguish without looking. See how others solved this on Reddit

WhatsApp has a media visibility setting that controls whether downloaded photos and videos show up in Samsung Gallery. Open WhatsApp > Settings > Chats and turn on 'Media visibility', and confirm WhatsApp has the storage/files permission under Settings > Apps > WhatsApp > Permissions. To force it on for one conversation, open that chat, tap the contact/group name to open chat info, tap 'Media visibility', and set it to Yes. See how others solved this on Reddit

WhatsApp has a built-in lock, and Samsung's Secure Folder is a stronger option. For the quick route, open WhatsApp > Settings > Privacy > Fingerprint lock and enable it so the app needs your fingerprint to open. For a full PIN/password lock, set up Secure Folder via Settings > Security and privacy > More security settings > Secure Folder, then add WhatsApp inside it (Add apps), so opening that copy requires your Secure Folder PIN, pattern, or fingerprint. See how others solved this on Reddit

WhatsApp's basic in-app camera sometimes picks the wrong lens on multi-camera Samsung phones. Instead of shooting from inside WhatsApp, open the Samsung Camera app first, take the photo with the main lens, then share it into WhatsApp via the attach (paperclip) > Gallery option. Keeping WhatsApp updated from the Play Store also helps, since newer versions handle the S20's lens selection more reliably. See how others solved this on Reddit