Download Messenger and, on the welcome screen, you will see an option that says "Not on Facebook?" From there, you can sign up with your name, phone number and a photo.
If you often chat with the same group of people, pin your conversation to a page for easy access.
You can choose to send a map of your location or another specific place, such as a spot where you would like your friends to meet you, as a separate message on Messenger.
To voice call with your friends on Messenger, tap on phone in the upper right hand corner of the screen from within a conversation. Messenger will automatically voice call your friend, depending on the specific request.