WhatsApp for Poco F3

First check the notification channel itself: open Settings > Notifications & Control Center > App notifications > WhatsApp > Messages and make sure the channel is on with a ringtone/sound selected (MIUI can silence a channel even when the app is allowed). Also confirm a sound is set inside WhatsApp under Settings > Notifications. Then rule out MIUI killing the app in the background by going to Settings > Apps > Manage apps > WhatsApp > Battery saver and choosing No restrictions, and make sure Do Not Disturb or Silent mode isn't active in Settings > Sound & vibration. See how others solved this on Reddit

There is no automatic iCloud-to-Android sync, so use WhatsApp's official Move to Android tool. Start the Poco F3 fresh (or reset it during initial setup), and when WhatsApp setup prompts you, connect the iPhone to the Poco with a USB-C to Lightning cable and follow the on-screen Move chats from iPhone steps. Note the iPhone needs iOS 15.5+ (a 6s on its latest iOS update qualifies). Paid tools like MobileTrans can also copy chats, but the official cable method preserves messages and media most reliably for free. See how others solved this on Reddit

Start by clearing only the cache: Settings > Apps > Manage apps > WhatsApp > Clear data > Clear cache (do not pick Clear all data, which deletes chats). Then update WhatsApp from the Play Store, since freezes are often fixed in newer builds. If it still crashes, set WhatsApp's Battery saver to No restrictions (Settings > Apps > Manage apps > WhatsApp > Battery saver) and turn on Autostart in Settings > Apps > Permissions > Autostart. As a last resort, back up your chats to Google Drive in WhatsApp > Settings > Chats > Chat backup, then reinstall. See how others solved this on Reddit

MIUI aggressively kills background apps, so first set WhatsApp's Battery saver to No restrictions in Settings > Apps > Manage apps > WhatsApp > Battery saver, and enable Autostart under Settings > Apps > Permissions > Autostart. You can also lock WhatsApp in recent apps so MIUI won't clear it: open the recents view, swipe down on the WhatsApp card, and tap the padlock. This lets the app keep receiving messages while the screen is off. See how others solved this on Reddit

A stuck badge is usually a cached notification state. First open WhatsApp and read or swipe away any lingering chats, then clear the app cache via Settings > Apps > Manage apps > WhatsApp > Clear data > Clear cache (cache only). If the phantom count remains, toggle the badge off and back on under Settings > Notifications & Control Center > App notifications > WhatsApp > Show notification badge, or restart the phone to force the launcher to refresh. See how others solved this on Reddit