WhatsApp for OnePlus 11

OxygenOS 15's aggressive background management combined with WhatsApp holding a persistent connection can spike drain. First exempt the app from optimization: go to Settings > Apps > App management > WhatsApp > Battery usage and set it to "Don't optimize" (Unrestricted). Next, in Settings > Apps > Special app access > Battery optimization, confirm WhatsApp is set to Don't optimize there too. Then clear WhatsApp's cache via Settings > Apps > App management > WhatsApp > Storage usage > Clear cache, and update WhatsApp from the Play Store, since older builds had a known wakelock issue on OOS 15. See how others solved this on Reddit

OxygenOS aggressively closes background apps to save power, which silences WhatsApp pushes. First lock the app in recents so it isn't killed: open the app switcher, swipe down on (or long-press) the WhatsApp card, and tap Lock. Then set Settings > Apps > App management > WhatsApp > Battery usage to Unrestricted (Don't optimize). Finally, open Settings > Apps > App management > WhatsApp > Notifications and confirm Allow notifications is on, and turn off Battery saver if it's active, since it throttles background sync. See how others solved this on Reddit

This is usually the proximity sensor thinking the phone is near your ear, so voice notes route to the earpiece instead of the loudspeaker. Wipe the top of the screen near the front camera, and if you use a screen protector make sure it doesn't cover the sensor area. As a workaround, play the voice note with the phone lying flat on a table (away from your face) so the sensor stays clear. If it persists, restart the phone and update WhatsApp; a stuck proximity reading is usually cleared by a reboot. See how others solved this on Reddit

WhatsApp compresses images heavily by default, which crushes the OnePlus camera's high-resolution files. In WhatsApp, go to Settings > Storage and data > Media upload quality and set it to "HD." For full, uncompressed resolution, send the photo as a document instead (in a chat tap the attach/paperclip icon > Document > browse > pick the image), which bypasses compression entirely. See how others solved this on Reddit

WhatsApp's built-in camera uses a basic camera interface rather than the OnePlus camera engine, so it lacks the processing, HDR, and autofocus tuning of the stock app. Make sure WhatsApp has camera permission via Settings > Apps > App management > WhatsApp > Permissions > Camera, and update WhatsApp. For sharp shots, skip the in-app camera: take the photo with the OnePlus Camera app, then attach it from the gallery in WhatsApp. See how others solved this on Reddit

Auto-downloaded media and a large cache balloon WhatsApp's storage. Open WhatsApp > Settings > Storage and data > Manage storage to review and bulk-delete large files and forwarded media. Turn off automatic downloads under the same Storage and data menu (Photos/Audio/Videos/Documents), and clear the app cache via Settings > Apps > App management > WhatsApp > Storage usage > Clear cache. Clearing cache is safe and won't delete your chats. See how others solved this on Reddit