9 Highest Grossing Smartphone Apps of All Time

Third-party smartphone apps have been there from the early Symbian days. But the revolution really took off with the arrival of iOS and Android. Android and iOS with their centralized app store concept managed to attract tons of users as well as developers. Apps can be clubbed into 3 different categories basically; free (ad-supported), paid, and freemium (where users have to do in-game ...