To ensure the prompt delivery of WhatsApp notifications, your phone must be configured properly.

• Make sure that WhatsApp notifications aren't muted in WhatsApp settings and in each chat:
  • Open WhatsApp, tap More > settings > notifications and make sure that message and group notifications are set to On.
  • Open the chat you wish to receive notifications from > More > group info or info and make sure the chat is not muted.
• Notifications on Windows Phone require a strong network connection; if your phone has a bad Internet connection or is on the edge/outside of a coverage area, it may take some time before WhatsApp is able to reconnect to your phone and deliver notifications.
• If the Battery Saver is enabled, notifications will not be delivered to conserve the battery. Make sure the Battery Saver mode is turned off under Windows Phone Settings > system > battery saver.
• Ensure WhatsApp is pinned to Start. That way, if you miss a notification, you can still see an unread message count on the live tile.

Please refer to the sections below for more steps for each operating system:

• Windows Phone 7
• Windows Phone 8
• Windows Phone 8.1

Windows Phone 7

Ensure your ringer is on and the box "All other notifications" is checked under: Windows Phone Settings > system > ringtones + sounds.

Windows Phone 8

• Ensure your ringer is on and the box "All other notifications" is checked under Windows Phone Settings > system > ringtones + sounds.
• Make sure that WhatsApp shows both a detailed status and a quick status on your lock screen in: Windows Phone Settings > system > lock screen:
  • Under Choose an app to show detailed status, select WhatsApp.
  • Under Choose apps to show quick status, tap on the icon you want to replace and select WhatsApp.

• Make sure you have configured your Wi-Fi connection, so it stays on when the screen times out. Go to Windows Phone Settings > system > Wi-Fi > advanced > Keep Wi-Fi on when screen times out.

• Make sure to turn off Restrict background data in data sense. To do this, swipe the start screen to the left to see the application list > Data Sense > Settings > Restrict background data > Off.

Windows Phone 8.1

• Make sure WhatsApp shows both a detailed status and a quick status on your lock screen in: Windows Phone Settings > system > lock screen:
  • Under Choose an app to show detailed status, select WhatsApp.
  • Under Choose apps to show quick status, tap on the icon you want to replace and select WhatsApp.
• Make sure to turn off Restrict background data in data sense. To do this, swipe the start screen to the left to see the application list > Data Sense > Settings > Restrict background data > Off.
• Go to Windows Phone Settings > system > ringtones + sounds > manage app sounds > WhatsApp > select desired settings.
• Go to Windows Phone Settings > system > notifications+actions > WhatsApp. Make sure that Show in action center is turned On.

Please read this article if you have issues connecting to the Push notification server.