It’s true. WhatsApp Messenger does not charge you anything in the process of using. You can send messages, make phone calls with other WhatsApp Messenger users, just have your device connected to the internet. If you use wifi, you do not need to pay anything. And if you use 3G, 4G, you just need to pay the normal size. That great. You can contact friends, family, relatives anywhere, any country. But pay attention, you can not call emergency numbers like police or 911.