Nokia X series devices are amazing but since they do not come preloaded with Play Store, there is no easy way to install WhatsApp.
Fortunately it is not impossible as folks at NokiaViews have laid out instructions on how to install WhatsApp on Nokia X series devices including Nokia X, XL and X+.
WhatsApp is the most popular instant messaging client and has enjoyed immense success in densely populated countries like India, China, Brazil and Indonesia. People use it because it is free for one year and without ads.
While it lacks voice calling unlike Viber, it is still regarded as must have as everyone already have it on their phone. There is no sticker support too but since it has become an indispensable application, people do not really care about what the WhatsApp lacks.