If the phone has a browser (like Opera Mini), some very basic web-based chat services may still function, though WhatsApp Web is compatible. Are you looking to this on a specific vintage phone model, or are you doing historical research on mobile app development?
WhatsApp officially stopped supporting Java-based platforms years ago. Most versions will now show a "System Date Error" or "Expired" message. Whatsapp 176x220 Jar
Since the official servers are closed for these versions, any "working" 176x220 .JAR file found online today is likely or fake . If the phone has a browser (like Opera
That tiny 176x220 .jar file was often less than 300KB. Compare that to today’s 200MB+ Instagram apps. Whatsapp 176x220 Jar