WhatsApp compatibility has some changes for iOS i.e. Apple users. As recently whatsapp has announced some set of rules for the compatibility for apple users and that can be little devastating for some apple . As we all know Apple phones are too costly so many people just buy Apple phones for showoff thing and usually buy the oldest model like iphone 5 and etc which doesn't have any software updates now . For such people WhatsApp will only run on the iOS devices with iOS 10 version and more ,below 10 will have to switch from WhatsApp or switch to latest iphone or switch to android. For such user it's high time now , no option but to switch something to stay socially active.