Now a days some application are in necessary in smartphones.
Just like whatsapp
Whatsapp is an social networking application where a person is connected through all of world without any of cost.
It consist of messaging, and caller service which is operated under internet connection. The best function of this application is that. U can connect only those people which is added in your contact book in mobile or smarphone.
I have used this application from last 3 year . And i am very happy to use this application. To till date it does not get any problem regarding messaging
There are many features are given in this application like . Last seen,
Message sent, message unsent, delivered, read, unread.
Which gives it great messaging service . And i am happy to use calling option in whatsapp .
And best of all i can be used in any of the world with internet connection.