The iPhone 6 and older models cannot update past iOS 12, meaning they are no longer compatible with the current Messenger app.
Facebook Messenger has strict system requirements. If your iPhone is too old to run newer software, the App Store may prevent you from downloading the app entirely. why can't i download facebook messenger on my iphone
If you're staring at a gray icon or a spinning wheel that never finishes, you aren't alone. The iPhone 6 and older models cannot update
Here is a comprehensive guide to identifying the problem and getting back to your chats. 1. Check Your iOS Compatibility why can't i download facebook messenger on my iphone