I like to use whatsapp. Its easy to use. I am using WhatsApp from last 4 years. People’s can use videocall option. They can use voice calling option. Whatsapp is very very usefull application in world. I think whatsapp is in every smartphone ( approx) . People’s can make groups on whatsapp. If u don’t have whatsapp then dont be late install is quickly. People’s can use whatsapp account on desktop.