WhatsApp for OnePlus 13

OxygenOS aggressively puts apps into deep sleep to save battery, which stops WhatsApp from receiving messages in the background until you open it. Open Settings > Battery > Battery Optimization, find WhatsApp and set it to Don't optimize, and turn off Advanced Optimization / sleep standby for the app. Also enable WhatsApp's auto-start and unrestricted background data so it can stay connected on the always-online OnePlus 13. See how others solved this on Reddit

This is usually OxygenOS's RAM and background management clearing the notification before you act on it, not a WhatsApp bug. Lock WhatsApp in the recents view so the system won't kill it, disable battery optimization for it, and turn off Suspend Execution for Cached Apps under Developer Options. Keeping the app unrestricted in the background prevents the OnePlus 13 from silently dropping its alerts. See how others solved this on Reddit

When the basic battery toggles don't help, the culprit is usually OxygenOS's intelligent sleep and standby optimization throttling the connection. Disable adaptive/sleep standby optimization and Wi-Fi power saving, and confirm WhatsApp has the high-priority notification category enabled in its in-app settings. If delays persist only on Wi-Fi, switch off Wi-Fi power-save and test on mobile data to isolate whether your network is dropping WhatsApp's push connection. See how others solved this on Reddit

The most reliable route is a same-account Google Drive backup: back up chats in WhatsApp on the old phone, then sign in with the same number and Google account on the OnePlus 13 to restore during setup. WhatsApp's built-in phone-to-phone transfer (QR code) also works well and avoids Drive limits, but make a Drive backup first as a safety net. Avoid relying solely on OnePlus Clone Phone for WhatsApp, since app-clone copies can fail to register the chats properly. See how others solved this on Reddit

Start by clearing WhatsApp's cache and confirming Camera permission is granted under Settings > Apps > WhatsApp > Permissions, then restart the phone so no other app is holding the camera. Make sure both WhatsApp and OxygenOS are fully updated, since this has surfaced as a software/codec bug fixed in later patches. If the camera works in the stock Camera app but not in WhatsApp, the issue is software, not hardware, and reinstalling WhatsApp usually clears it. See how others solved this on Reddit

Notifications for a parallel/cloned app are controlled separately, so toggling them only on the main WhatsApp won't help. Open Settings > Apps and find the cloned WhatsApp (it has its own entry with the orange badge), then enable its notifications and exclude it from battery optimization just like the original. Both the cloned app and the Parallel Apps system service need background permission, or OxygenOS will silence the second account. See how others solved this on Reddit