WhatsApp for Vivo X100 Pro

OriginOS aggressively kills background apps to save battery, which delays or blocks WhatsApp notifications. Open Settings > Battery > High background power consumption and allow WhatsApp, then go to Settings > Apps > Manage apps > WhatsApp > Battery and choose "Don't restrict." Also lock WhatsApp in the Recent apps screen (swipe down on its card or tap the lock icon) so the system stops clearing it from memory. See how others solved this on Reddit

The reliable OriginOS fix is to enable auto-start and remove all battery restrictions for WhatsApp. Go to Settings > Apps > Auto-start manager (Permissions > Auto-start on some builds) and turn WhatsApp on, then Settings > Battery > Background power consumption and allow background activity for WhatsApp. Finally turn off the global "intelligent" battery optimization under Settings > Battery so the phone stops suspending the app's push connection. See how others solved this on Reddit

WhatsApp's official iOS-to-Android transfer must be done during the initial Android setup, not afterward. When you first set up the Vivo (or after a factory reset), connect the iPhone with a USB cable when the setup wizard prompts to copy data, then follow WhatsApp's on-screen "Move to Android" steps and scan the QR code shown. Your iCloud backup cannot be restored directly on Android, and Vivo's EasyShare only moves media and apps, not your encrypted chat history, so the cable transfer during first-time setup is the only way to keep older chats. See how others solved this on Reddit

Missed or non-ringing WhatsApp calls are almost always the background-restriction issue, since the call push can't wake the app. Go to Settings > Apps > Manage apps > WhatsApp > Battery and select "Don't restrict," enable WhatsApp under Settings > Apps > Auto-start manager, and make sure WhatsApp has Phone and Microphone permissions under Settings > Apps > Manage apps > WhatsApp > Permissions. Also confirm Do Not Disturb is off in the Settings > Notifications and status bar menu. See how others solved this on Reddit

When photos won't download or appear as blank thumbnails, it's usually a storage-permission or auto-download problem. Go to Settings > Apps > Manage apps > WhatsApp > Permissions and grant access to Photos and media (and "Allow management of all files" if prompted), then in WhatsApp open Settings > Storage and data > Media auto-download and enable photos for mobile and Wi-Fi. If images still won't appear, clear WhatsApp's cache under Settings > Apps > Manage apps > WhatsApp > Storage and restart the phone. See how others solved this on Reddit

If WhatsApp messages only appear in the status bar without a banner, turn on floating notifications. Go to Settings > Notifications and status bar > WhatsApp, enable "Allow notifications," then open the "Messages" channel and turn on "Floating notifications" (banners) along with sound. On some OriginOS builds you may also need to enable "Floating notifications" globally in Settings > Notifications and status bar so the banner style is permitted. See how others solved this on Reddit