It sounds like you're referring to the (a feature phone running Series 40 OS) and a .JAR file that allowed Facebook Chat functionality—likely eBuddy , Nimbuzz , or a dedicated Facebook Chat J2ME app from the late 2000s / early 2010s.

Would you like a step-by-step guide to running these old JARs in an emulator, or a deeper protocol dump of the Facebook XMPP handshake from that era?

public class FBJabber extends MIDlet implements CommandListener SocketConnection sc; OutputStream os; void connect() throws IOException sc = (SocketConnection) Connector.open("socket://chat.facebook.com:5222"); os = sc.openOutputStream(); String streamOpen = "<stream:stream to='chat.facebook.com' xmlns='jabber:client' xmlns:stream='http://etherx.jabber.org/streams' version='1.0'>"; os.write(streamOpen.getBytes()); // Then send <auth> + <iq>...

If you need chat on a Nokia 2700 now, the only option is or IRC via J2ME IRC clients (e.g., wirc.jar ).