Why my phone not support Facebook and messenger app?
What model of iPhone do you have?
What iOS version is it running?
Why do you say they are not supported? What exactly is happening?
Explain the issue and provide so e relevant details and maybe someone can help?
my iphone model is 7plus.
14.6 iso version is running on my iphone
An unexpected errer occured.
An unexpected error does not mean the App is not supported. It just means an error occurred.
Try rebooting the iPhone and opening the App again and see if it works.