However, if you try to install that old .sis file today, you will encounter a brutal error: Why? Because Facebook’s Graph API (Application Programming Interface) has been updated hundreds of times. The old app uses SSL certificates and authentication protocols that the modern internet has deemed insecure and obsolete. The app is dead.

: Widely considered the "gold standard" for Facebook on Symbian. It featured a full menu with icons for the news feed, chat, notifications, and "Places" check-ins.

Use the mobile web interface:

Some retro-tech communities develop custom clients or wrappers that allow older devices to communicate with modern APIs, though these often require advanced technical setup.

Even if you get mbasic.facebook.com running in Opera Mini, you’ll hit a wall: Two-Factor Authentication (2FA). The E90 cannot render the modern 2FA pop-up windows.

The most reliable way is to use the built-in "Web" browser or a third-party browser.