Join the people of your life instantly, and free of charge. Messenger is like texting, except that you do not have to pay for each message (it works with your data plan).
Not just for Facebook friends: send messages to people in your phone book and simply enter a phone number to add a new contact.
Free calls: talk as long as you want, even with people from other countries.
Receive notifications when people have seen your messages.
Transfer messages or photos to people who did not participate in the conversation.
Look for people and groups to contact them quickly.
Activate the location to indicate that you are nearby.
For More Info Google Play
varies with device