While official support from Meta (Facebook) has ended for Symbian, you can still find legacy application files through third-party archives and community-hosted sites:
To download and install on the Nokia E63 , you must use legacy software compatible with the Symbian S60v3 operating system. Modern versions of the Facebook Messenger app—built for Android and iOS—will not work on this device. How to Download Facebook Messenger for Nokia E63 nokia e63 facebook messenger download