Using it since 5 years now, well its a simple messaging app . There are many competitors like Hike, Vchat and etc etc But we all love these one
The concept of whatsapp is old but only Whatsapp made itself very popular
Reasons
1 . Simplicity and Classy - its very very easy to use . even old people easily understand it .
whereas other apps just make them pull their hairs
2 .UX/UI - refers to its layout and design In one word its classy .
Share Stuff - You can send SONGS, PICTURES, CONTACTS, DOCUMENTS, n even Your own Location .
Usefullness - well an app having so many things in one is extremely useful
The latest update has got the Encryption thing included in it. Through this update Your Messages will be encrypted from end-to- end
This adds to yet Another good thing to The always Loved Whatsapp.
N Whatsapp basically is very popular amongst all . so if some new app has to come its really tough .
And also whatsapp is freely downloadable from Play Store and For Nokia and Apple as well from their respective strores .