Once installed, verification was done via SMS—just like today. The app would send an automated code to your number, which you typed into the Java interface.
WhatsApp officially ended support for Nokia S40 and J2ME-based devices on . Can You Use WhatsApp on Java Phones Today? Whatsapp java j2me
The final Java version (2.11.xx) was released in 2016. After that, users saw a persistent message: "This version of WhatsApp is no longer supported. Please upgrade to a supported device." Once installed, verification was done via SMS—just like