For some reason, you might want to view messages from people you're not friends with on Facebook Messenger using your Android, but you don't know how to do it. Discover with a few very simple tips how to get there.
Steps

Step 1. Open Messenger
The app icon looks like a blue chat bubble with a white lightning bolt in it, and you can find it on your device's main screen or in the apps panel.

Step 2. Log in to Messenger
If you haven't already, enter your phone number. Then press To continue and enter your password.

Step 3. Touch the icon that looks like a black chat bubble
In front of this icon you will see New invitations from me… and it is located above your friends' messages.

Step 4. Read your messages
Once you tap this icon, you will see messages received from Messenger users who you are not yet friends with on Facebook.