From the beginning of 2017 WhatsApp will not work on older devices. The app will not run on the devices running outdated software like Android 2.2, Windows Phone 7 and also on iOS 6.
According to the reports, there are only very few users using these outdated operating system specially when it comes to Android platform and around 8% Apple users using older iOS. The Windows mobile users running Windows 7 will not get WhatsApp after 2017.
It is rather difficult to maintain the programming standards with older OS, cause these older OS running on outdated hardware, most of the time don’t match up with the capabilities.
The solution for this is to buy a new handset with latest operating system .