Which product design innovation is credited with making touchscreen smartphones mainstream and fundamentally changing mobile device interfaces forever?

Throughout history, certain product designs have revolutionized how we interact with technology. These breakthrough designs not only solved existing problems but created entirely new paradigms for human-technology interaction. This trivia question focuses on one of the most influential design innovations that transformed an entire industry and changed how billions of people interact with technology daily.

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• The iPhone's multi-touch interface (2007)
• The BlackBerry's physical QWERTY keyboard (1999)
• The Palm Pilot's stylus-based touchscreen (1997)
• The Motorola RAZR's ultra-thin flip design (2004)

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