According to the reports, WhatsApp is upgrading
its technology and might not work in some mobiles. More than one billion users
are using WhatsApp per month and the number might come down soon. Reports
suggests that, to increase the features of the app, WhatsApp is going for a
technology upgrade. Android 2.1 and 2.2, Windows Phone 7 and iPhone 3GS or iOS
6 may not support WhatsApp from 2017.