A free app for Android, by SmartClick.

If you want to experience a completely new way of making calls and sending text messages internationally, X Calling is the best app to use. It offers the best rates and services to make calls and send text messages abroad. It is completely free to download.

X Calling is a VOIP (Voice Over Internet Protocol) app that allows you to call and send text messages to anyone in the world for free. You don’t need to subscribe to a service or pay for a phone call. You don’t need to create an account.