Which ride-hailing service launched the first mobile app that allowed customers to summon and pay for rides directly from their smartphones?

The transportation industry has been dramatically transformed by mobile commerce innovations. Ride-hailing apps have revolutionized how we move around cities, creating new business models and changing consumer expectations for on-demand services. This trivia question tests your knowledge about a pivotal moment in transportation history that merged technology with traditional taxi services to create an entirely new product category.

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Uber, with its initial 'UberCab' app launched in San Francisco in 2010
Lyft, originally named 'Zimride' when it introduced its first mobile payment system in 2008
Didi Chuxing, which pioneered smartphone-based taxi hailing in China in 2009
Hailo, the London-based taxi app that first connected licensed cab drivers with passengers in 2007