WhatsApp for Tecno Spark 30 5G

Tecno's power-saving features aggressively kill background apps, which blocks incoming WhatsApp calls. Go to Settings > Apps > WhatsApp > App battery usage (or Battery) and set it to Unrestricted, then open the Phone Master app, find Auto-launch / background app management, and allow WhatsApp to keep running. Also confirm WhatsApp has the Microphone and Phone permissions enabled under Settings > Apps > WhatsApp > Permissions. See how others solved this on Reddit

These HiOS-related lag and System UI crash issues are usually eased by clearing cached data and updating the system. Go to Settings > Apps > WhatsApp > Storage and tap Clear cache (not Clear data, which would log you out), then check Settings > System > System update for the latest HiOS patch. If lag persists, enable Developer options (tap the build number 7 times in Settings > About phone) and set Window/Transition/Animator animation scale to 0.5x to make the UI feel snappier. See how others solved this on Reddit

Random shutdowns on Tecno devices are often caused by a faulty battery reading or an unstable HiOS build rather than a true power fault. First update the system under Settings > System > System update, then boot into Safe Mode (hold the power button, then long-press the Power off option) to see if a third-party app is the cause. If it keeps shutting down, back up your chats via WhatsApp > Settings > Chats > Chat backup and have the battery checked at a Tecno service center. See how others solved this on Reddit

The front camera produces motion blur in dim lighting because it lowers the shutter speed to capture more light, so any movement smears the image. For clearer WhatsApp video calls, add a front-facing light source and hold the phone steady. For still selfies sent in chats, use the stock Camera app's photo mode rather than WhatsApp's in-app camera, since the photo mode applies more processing and stabilization than the live call stream. See how others solved this on Reddit

HiOS battery optimization is the main reason WhatsApp messages arrive late or without a sound. Go to Settings > Apps > WhatsApp > App battery usage and set it to Unrestricted, then enable Auto-launch for WhatsApp in the Phone Master app so it can run in the background. Finally, open WhatsApp > Settings > Notifications and confirm the conversation tones and notification sound are turned on. See how others solved this on Reddit

The Spark 30 5G handles WhatsApp fine, but the bundled HiOS bloatware and ad-heavy system apps can slow it down out of the box. After first boot, update the system via Settings > System > System update, then disable unwanted preinstalled apps under Settings > Apps and turn off recommendation ads in the Phone Master and App Market settings. This frees up RAM and storage so WhatsApp media, backups and calls stay responsive. See how others solved this on Reddit