WhatsApp To End Support After 31 December 2016 On Older Phones
WhatsApp had announced it will stop supporting older smartphones, which included the earliest versions of Android, iPhone, Nokia, BlackBerry, and Windows Phone 7 by end of 2016. WhatsApp is stopping support for all those running on Android 2.1 and Android 2.2, Windows Phone 7, BlackBerry 10 the iPhone 3GS, and or any other iPhone still on iOS 6. WhatsApp’s intentions to discontinue service on dying platforms were known since March, now we have a date.
You can use WhatsApp in those Devices and operating system till 31/12/2016 . After this date you will not Receive any Update from them in your Smartphone.
IF you are using latest Versions of android or Ios then you Don’t have to worry about anything.