WhatsApp for Vivo X200

This is usually Vivo's aggressive battery management killing WhatsApp's background connection. Go to Settings > Battery > Background power consumption management, find WhatsApp and set it to Allow high background power consumption, then go to Settings > Apps > Manage apps > WhatsApp > Battery and disable any battery optimization. Also lock WhatsApp in Recents (swipe up to open recents, pull the card down to lock it) so the system stops clearing it. See how others solved this on Reddit

OriginOS/Funtouch's auto-launch and power restrictions are pausing WhatsApp when the screen is off. Open Settings > Battery > Background power consumption management and set WhatsApp to Allow high background power consumption, then in Settings > Apps > Auto-start management enable auto-start for WhatsApp. Finally check Settings > Apps > Manage apps > WhatsApp > Notifications is fully enabled so alerts still arrive when the app is closed. See how others solved this on Reddit

WhatsApp heavily compresses video, and the X200's HDR/Dolby footage often looks washed out after that re-encoding. In WhatsApp tap the attach icon, pick the video, then tap the HD toggle at the top and choose HD quality before sending. For important clips, record in a standard (non-HDR) profile via the Camera settings, or send the file as a Document instead of a video to skip WhatsApp's compression entirely. See how others solved this on Reddit

The X200's notification throttling and Do Not Disturb rules commonly silence WhatsApp calls. Go to Settings > Notifications & status bar > WhatsApp, enable Allow notifications, and make sure the Calls channel is set to make sound and pop on screen, with Lock screen notifications turned on. Then in Settings > Apps > Auto-start management and Settings > Battery > Background power consumption management, allow WhatsApp so incoming calls can wake the phone. See how others solved this on Reddit

For an Android-to-X200 move, back up on the old phone via WhatsApp > Settings > Chats > Chat backup to Google Drive (same Google account), then restore during setup on the X200. Coming from iPhone, use the official iOS-to-Android flow: in WhatsApp on the X200 it will prompt you to scan a QR code, then install Move to iOS/Move to Android as directed, connect both phones with a cable, and follow the in-app prompt so chats migrate without needing iCloud. See how others solved this on Reddit

Verification stalls usually come from the SMS not reaching the right SIM or being filtered. Confirm the correct SIM is set for SMS in Settings > SIM management (or Settings > Mobile network > SIM management), check Messages and the blocked/spam folder for the 6-digit code, and make sure WhatsApp has SMS and Phone permissions under Settings > Apps > Manage apps > WhatsApp > Permissions. If the code still doesn't arrive after a minute, choose Call me instead, or briefly toggle Airplane mode to refresh the network. See how others solved this on Reddit