Which famous CEO started their entrepreneurial journey by selling Blue Box devices that allowed users to make free long-distance phone calls?

Before becoming household names, many famous tech CEOs started with smaller or lesser-known ventures that shaped their future success. This trivia tests your knowledge about the early entrepreneurial journeys of today's tech moguls. Do you know where these product visionaries got their start?

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Steve Jobs (Apple)
Bill Gates (Microsoft)
Mark Zuckerberg (Facebook/Meta)
Jeff Bezos (Amazon)