A free program for Android, by Hazaa Akram Al Balushi.

“Omar Chat” is an instant messaging application for chatting, calling, sharing photos, and sending and receiving messages with your friends and family. It is designed to provide a fast, simple, and convenient way to communicate with people you care about. You can send messages to anyone you want, regardless of who is in the other party. The best thing about this app is that it works on your phone or tablet, so you can chat with your friends on the go.

The most important thing is that it is FREE. You do not need to pay to use this app.