Whatsapp is the best messenging app now a days! im using it since last 3 yrs nd its very easy to use and very popular app that most of the mob and internet user use this so you can connect with then free of cost . you must have a internet connection to use this app . I use it on a regular basis for texting my friends .family. college groups sharing of songs, videos, pictures etc. its a very user friendly app! and it is giving much upgrade ton its bugs n errors. the only thing I dont like in whatspp is its calling feature its not so good as the other meesenging app provide so it must be worked upon this:)