Not being able to use WhatsApp is no fun, so if you are having trouble connecting, keep reading. To start, there are many reasons why you may not be able to connect to WhatsApp, so we have listed a few of the most common reasons.
The most common reason why you cannot connect to WhatsApp is because your phone is not connected to the internet.
To ensure you have a working internet connection, check the following:
You have a data plan on your carrier's network or a Wi-Fi connection with internet access.
Make sure the signal strength for Wi-Fi or data network is good and that the phone is connected to the network.
Open a webpage in your phone browser to see if it loads. If it loads, your phone is connected to the internet!
Reboot your phone.
If you cannot connect to the internet through your Wi-Fi network, try connecting to a different Wi-Fi network or connecting over your phone's data network.
If you can open webpages and run other applications that connect to the internet on your phone, but WhatsApp will still not connect, try deleting and reinstalling WhatsApp. Learn how to reinstall WhatsApp on: Android | BlackBerry | iPhone | Nokia
If you can connect to other applications on your data network, but not WhatsApp, it could be that your mobile provider has configured your wireless access points to block certain chat applications.
Try this if WhatsApp still will not work on data only:
Contact your mobile provider and ask them about different access point settings to run chat apps.
They will guide you through a process in which you will manually configure your data network and web settings.
Thats what I did and it worked, also try the last step of changing your access point !