Apple banned America’s No. 1 iPhone app.

The most popular iPhone app in America may owe its appeal to government crackdowns on Apple.

That App is  Delta, allows you to play classic video games like "Super Mario Bros." on your iPhone.

Delta is a sort of software known as video game "emulators" that Apple has prohibited.

Apple has banned apps like it for years, but unbanned them this month with little explanation.

Delta's developers claim that Apple's flip-flop was the result of mounting anti-monopoly pressures.

Apple's official App Store is a simple and largely safe place to download apps and make purchases.