A free program for Android, by Messenger : Free Texts and Messages.

Messenger Go is an all-in-one messaging and social media app, available on Android devices. It allows you to send instant messages (IM) and video calls (VC) to your friends and family members. It is one of the best messaging apps available in the Android app store and has an impressive user interface.

IM & VC

IM & VC is an instant messaging and video calling app, allowing users to send and receive messages and calls over a mobile data connection. It is available on Android devices and is compatible with all mobile data carriers (including carriers that provide only 2G Internet service). This application is an alternative to the regular SMS and MMS messaging apps.