You cannot simply go to the Nokia Store (RIP) or a direct link from Facebook to download a working app anymore. The official Facebook for Symbian app stopped authenticating around 2015, and the servers for the dedicated "Facebook Chat" app were shut down years ago.
Keeping the Conversation Alive: How to Download Facebook Chat on Symbian Phones in 2026 download facebook chat for symbian phones
Disclaimer: Facebook frequently changes its security protocols. This method works as of April 2026. Use legacy devices at your own security risk. You cannot simply go to the Nokia Store