Whatsapp help lot of people to get connected around the world. its the main reason why people are not buying sms pack which was the mainstream before whatsapp. people nowdays ask are you on whatsapp . whatsapp help alot of people making life there very easy helping connecting people whatsapp is avilable on andriod, java, windows phone, ios and you can also use whatsapp on your web using your PC . WHATSAPP ALSO INTRODUCE VOICE CALLING FUNCTIONALITY AND THEY ARE WORKING ON VIDEO CALL FEATURE .