Apple banned America’s No. 1 iPhone app.

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

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

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

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

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

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

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