Yes, that includes BlackBerry 10 — an OS that last shipped on a new phone less than a year and a half ago. BlackBerry itself eschewed the OS when building its latest flagship, the Android-powered Priv slider phone, so perhaps it should come as little surprise that major developers like the Facebook-owned WhatsApp are abandoning it as well.
WhatsApp’s announcement also includes Nokia’s low-end phones, as well as the older Android 2.2 and Windows Phone 7.1 operating systems. The Nokia S40 discontinuation will likely put many users of older Nokia phones in developing countries in a bit of a bind. WhatsApp suggests “upgrading to a newer Android, iPhone, or Windows Phone” if you want to keep on using the service — if not, you’ll need to find another messaging service by the end of the year, when the app will be officially discontinued on the older platforms.