This is the best chatting App amongst all others. I installed hike and many other apps but got bored within few days.
But, whatsapp is always there in my phone.
It is the most easy-to-use, simple, user-friendly and fast chatting app(that too free).
The latest version(with voice messaging and calling) is remarkable.
I deleted it some times but it is very easy to re-install it and it takes just a few minutes to download this app.
Data is also recovered very easily while re-installing.
Almost each of my friend is on whatsapp.
This app has failed the old messaging technique which was chargeable and lengthy for customer.