 <p>I think you need to implement a kind of a chat and not how to send a SMS via WiFi.</p> <p>There is a good example at the Android Developers page: <a href="https://code.google.com/p/simple-android-instant-messaging-application/" rel="nofollow">https://code.google.com/p/simple-android-instant-messaging-application/</a></p> <p>Also check this link : <a href="http://stackoverflow.com/questions/16954712/android-whatsapp-chat-examples">Android Whatsapp/Chat Examples</a></p> <p>gl, Refael</p>