If you’ve got an older smartphone and are a fan of using WhatsApp to keep in touch with international friends, you might need to upgrade. On February 1st, those older devices will be unable to run it. For Android, we’re talking any device that’s running Android 2.3.7 or older. For iOS, it’s any phone still running iOS 8 or older. If you’re still using either of those, you’re long overdue for an upgrade anyway.
Source:Uber Gizmo