Search for "Messenger." A list of results that match Messenger will be displayed. Select the "Messenger" from the results. Choose the Messenger app developed by "Facebook," which should be towards the top of the list. Tap "Install." Review the required permissions and then tap "Accept" if you still want to install.
Do I have to install Messenger on Facebook?
No. You'll need to create a Facebook account to use Messenger. If you had a Facebook account but deactivated it, learn how to keep using Messenger.
How do I reinstall Messenger on my phone?
To reinstall Messenger, open the App Store and tap the Search tab in the lower right hand corner. Type in “Messenger”, then tap the cloud icon with an arrow point down to reinstall the app.
What happened to my Messenger on Facebook?
If your Messages icon on Facebook is missing from the left-hand column, then you may have removed it accidentally. To get it back, you need to load a page with all of your account's installed Facebook apps and add it to your favorites. You can add other favorite apps to this section with the same method.