Facebook-owned WhatsApp is one of the popular messaging app available on the mobile platform. The service has managed to penetrate into our lifestyle so much that it is excruciatingly difficult for most users to switch to alternatives. In fact, the recent privacy-related controversy makes a compelling case. It looks like that’s not only what WhatsApp has in store for us. According to a new report, WhatsApp might not work on older iPhones at all.