Final answer:
Jobs and Wozniak created and sold an illegal 'blue box' to make free phone calls.
Step-by-step explanation:
The illegal device that Steve Jobs and Steve Wozniak ("Woz") manufactured and sold before founding Apple was the blue box. This device allowed users to make long-distance phone calls without incurring charges by emitting tones that mimicked those used by the telephone company's switching systems. Despite its illegal nature, the blue box was an important part of technological history, as it helped fund the beginnings of Apple and provided Jobs and Wozniak with valuable experience in the tech industry.
They built these computers in Jobs' parents' home and sold them to hobbyists and electronics enthusiasts. The Apple I was considered illegal because it violated certain copyright laws, but it laid the foundation for Apple's success and revolutionized the personal computer industry.