How to send messages with WhatsApp for Windows 10 Mobile phones

[Windows Central]

Send text messages, emoji, contacts, and locations using WhatsApp for Windows 10 Mobile phones
Love sending messages but worried about going over the limits of your phone plan? Try using WhatsApp!
If you're connected to Wi-Fi and using WhatsApp, you don't have to worry about data limits, talk time, or the number of messages you're sending. WhatsApp lets you keep in touch with friends and family the way you want!
You can also use WhatsApp when you're on a trip to talk with people back home, avoiding the need to buy a travel plan. Mastering the basic messaging functions in WhatsApp is simple.

Full story from the WindowsCentral blog...