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by toast0 548 days ago
WhatsApp ran on Nokia S40, which is J2ME, but it did not run on other J2ME phones (unless there was some way to put the s40 app bundle on them? I never heard about that).

There was a period of time where someone was selling low end phones with an unauthorized and incomplete client built in... In addition to not supporting group messages, it apparently had a backdoor to remote send spam.