If you can't connect to WhatsApp, this is usually caused by a problem with your Internet connection or your phone's settings. It might not be necessary to delete and reinstall WhatsApp.
Troubleshooting
Most connection issues can be resolved by doing the following:
- Restart your phone, by turning it off and back on.
- Update WhatsApp to the latest version available on the Google Play Store.
- Open your phone's Settings > tap Network & internet > turn Airplane mode on and off.
- Open your phone's Settings > tap Network & internet > Data usage > turn Mobile data on.
- Open your phone's Settings > tap Apps & notifications > WhatsApp > Data usage > turn Background data on.
- Open your phone's Settings > Network & internet > Wi-Fi > turn Wi-Fi off and on.
- Try connecting to different Wi-Fi hotspots.
- Make sure Wi-Fi stays on during sleep mode.
- Reboot your Wi-Fi router.
- Contact your mobile provider and make sure your APN settings are configured correctly.
- Upgrade your Android operating system to the latest version available for your phone.
- If you're having trouble connecting to WhatsApp while on a Wi-Fi network that you don't normally connect to, contact the network administrator.
- Make sure your connection isn't on a managed Wi-Fi network, such as at your office or university campus. Your network might be configured to block or limit connections.
- WhatsApp isn't designed to be used with proxy or VPN services, so we can't provide support for those configurations.
- Turn off roaming.
For issues with receiving notifications for WhatsApp messages, read this article.