Wastapp is the best app. I hv been using this app from past 2 yrs and this app is just awesome. It is a free app and is available for android and other smartphones. Watsapp uses any internet connection that is 4g 3g 3g or wifi as per available.through this app we can send recive videos photos documents vioce message. We can use watsapp calling to call our friends and families even if they are in another country.we can create groups in watsapp through which we can easily be in contact with your friends or family. Wastapp is free of cost and is a safe app. Anyone can easily use this app. And as per every phone should have watsapp in them.
thank you