Which groundbreaking product design innovation, introduced in 2007, eliminated physical keyboards on smartphones and revolutionized mobile interfaces?

Product design isn't just about aesthetics - it's about solving problems in revolutionary ways. Some product designs have completely transformed industries and how we live our daily lives. This trivia question focuses on a significant design innovation that changed how we interact with technology. Test your knowledge about this pivotal moment in product design history!

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Apple's Multi-Touch interface on the original iPhone
BlackBerry's trackball navigation system
Nokia's Symbian S60 touch interface
Palm's Graffiti handwriting recognition