WhatsApp for Oppo

ColorOS 15 aggressively freezes background apps to save battery, which delays WhatsApp messages until you manually open it. Go to Settings > Battery > tap the three-dot menu (top right) > App battery management, find WhatsApp and set it to 'Allow background activity' / 'Don't optimize'. Then open the recent apps (multitasking) view, swipe down on the WhatsApp card and tap the lock icon so ColorOS stops killing it in the background. See how others solved this on Reddit

ColorOS aggressively manages background apps, which can break WhatsApp on the Find X8 Pro. Go to Settings > Battery > (tap the three-dot menu or App battery management) and find WhatsApp, then set it to Allow background activity and turn off Allow app to sleep. Also open Settings > Apps > App management > WhatsApp and confirm it is up to date via the Play Store, since several stability issues were addressed in WhatsApp updates. If it still crashes, clear the cache under Settings > Apps > App management > WhatsApp > Storage usage > Clear cache (this does not delete chats). See how others solved this on Reddit

ColorOS aggressively kills background apps to save battery, which silences WhatsApp pushes. Go to Settings > Battery > tap WhatsApp and turn off the background restrictions, then in Settings > Apps > Manage apps > WhatsApp > Battery usage set it to "Allow background activity" and turn off "Allow battery optimisation." Finally lock WhatsApp in the Recent apps screen (swipe up to Recents, pull down on the WhatsApp card and tap the lock icon) so the system stops clearing it. See how others solved this on Reddit

ColorOS aggressively closes background apps, which can silence WhatsApp call alerts. Go to Settings > Battery > tap WhatsApp and turn on "Allow background activity" and disable any battery optimization or "Sleep standby optimization" for it. Then open Settings > Apps > Manage apps > WhatsApp > Notifications and make sure the Calls channel is enabled with sound and the option to show on the lock screen. Finally, open the Recent Apps view (swipe up and hold), press the WhatsApp card, and tap the lock icon so the system stops clearing it from memory. See how others solved this on Reddit

ColorOS aggressively freezes background apps to save battery, which is the most common cause of delayed WhatsApp alerts on the Find X6 Pro. Go to Settings > Battery, tap the gear/three-dot menu, open App battery management, find WhatsApp and set it to "Allow background activity" while turning off "Allow auto-optimization". Also long-press the WhatsApp card in Recent apps and tap the lock icon so it isn't cleared from memory. See how others solved this on Reddit

ColorOS aggressively manages background apps, which stops WhatsApp from drawing the full-screen call screen over your lock screen. Go to Settings > Apps > App management > WhatsApp > Notifications and enable Allow notifications, Lock screen notifications, and Banners. Then go to Settings > Battery > Power saving (or Settings > Apps > App management > WhatsApp > Battery usage) and set WhatsApp to Allow background activity / Don't optimize. Finally, open Recents, swipe down on the WhatsApp card and tap the lock icon so the system stops closing it in the background. See how others solved this on Reddit

ColorOS battery optimization is the usual culprit, so go to Settings > Battery (or Settings > Apps > App management > WhatsApp > Battery usage) and set WhatsApp to Allow background activity, then enable Allow auto-launch under App management. Also open Settings > Notifications & status bar > WhatsApp, turn on Lock screen notifications and the Calls channel, and disable any battery saver or sleep schedule that might silence apps overnight. See how others solved this on Reddit

ColorOS aggressively restricts WhatsApp in the background, which can stop incoming-call notifications from ringing or appearing. Go to Settings > Apps > App management > WhatsApp > Allow auto-launch (turn it on), then under the same screen set Battery usage to "Allow background activity" / "Don't optimize". Next open Settings > Notifications & status bar > WhatsApp, enable Call notifications, and turn on lock screen notifications and banners so calls appear over the lock screen. It also helps to lock WhatsApp in the Recents view (open multitasking, pull down on the WhatsApp card and tap the lock icon) so the system can't clear it. See how others solved this on Reddit

ColorOS aggressively freezes background apps, so open Settings > Battery > tap WhatsApp and set it to "Allow background activity" and disable "Sleep standby optimization" for it. Then open Settings > Apps > WhatsApp > Notifications, make sure the "Calls" notification channel is enabled and set to play a sound, and inside WhatsApp confirm Settings > Notifications has notifications turned on. See how others solved this on Reddit

WhatsApp's official iOS-to-Android move only works while the Oppo is factory-fresh, so do it during first-time setup: when ColorOS shows the Android setup wizard, open WhatsApp on the iPhone (Settings > Chats > Move Chats to Android), then scan the QR code shown on the Oppo and connect the two phones with a USB-C cable (use a Lightning-to-USB-C adapter if your iPhone has a Lightning port). If your Reno 12 is already set up, the only reliable way is to back up first, then factory reset it (Settings > System settings > Back up and reset > Erase all data) and run the move during the initial setup wizard, since the official transfer can't be triggered afterward. See how others solved this on Reddit