If you can't connect to WhatsApp, this is usually caused by a problem with your Internet connection or your phone's settings.
Most connection issues can be resolved by doing the following:
- Restart your phone, or turn it off and on.
- Update WhatsApp to the latest version available on the Apple App Store.
- Open iPhone Settings > toggle to turn Airplane Mode on and off.
- Open iPhone Settings > tap Cellular > toggle to turn Cellular Data on.
- Open iPhone Settings > tap Wi-Fi > toggle to 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.
- Open iPhone Settings > tap General > Reset> Reset Network Settings > Reset Network Settings. (This will delete all your saved Wi-Fi passwords).
- Upgrade or restore your iPhone's operating system to the latest version for your phone.
- If you're using an unlocked iPhone or a pre-paid SIM card, you might need to adjust your phone's APN settings for your SIM card. Contact your wireless carrier for details and instructions.
- 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.
- If you're on a campus or corporate Wi-Fi that has firewall restrictions in place, contact the network administrator.
- WhatsApp isn't designed to be used with proxy or VPN services, so we can't provide support for those configurations.
For issues with receiving notifications for WhatsApp messages, read this article.
Learn how to troubleshoot connection issues on: Android | Windows Phone | Nokia S40