The WhatsApp Java JAR is a Java library that allows developers to interact with the WhatsApp messaging service programmatically. It provides a set of APIs that can be used to send and receive messages, make voice and video calls, and access other WhatsApp features.

: Unofficial developers have released custom J2ME clients that can send and receive text messages and some images. These apps typically require you to authenticate through a separate website to bridge the connection to WhatsApp's modern servers. KaiOS App Store

: If your feature phone (like newer Nokia keypad models) runs