The smartphone that defined a generation before the iPhone existed

Technology · Published 18 October 2026 Swipe more like this →

In short: Before the modern glass slab, there was a device designed to be held with two hands, featuring a swiveling screen and a physical QWERTY keyboard. It wasn't just a phone; it was a cloud-based communicator that pioneered mobile apps and social networking for a generation of young consumers.

The Danger Hiptop, later rebranded as the T-Mobile Sidekick, debuted on October 1, 2002. While competitors like BlackBerry and Palm targeted the business world, the Hiptop captured the youth market. This 'PDA phone' merged mobile calling with a complete HTML-capable web browser and AOL Instant Messenger, featuring a distinct layout where a 180-degree hinge rotation exposed the keyboard.

Technologically, the device was ahead of its time by utilizing cloud-based, Java-made software. This allowed it to synchronize with back-end services provided by Danger, Inc., offering a catalog of downloadable apps, email, and instant messaging. This architecture was so significant that Microsoft eventually purchased Danger for $500 million in 2008, using the technology to attempt to build the Microsoft Kin.

The product line evolved rapidly through several iterations, including the Sidekick 2 (2004), the Sidekick 3 (2006), and the Sidekick LX (2007). Each iteration introduced hardware milestones like VGA cameras, Bluetooth, and 3G connectivity. Even the Sidekick iD, a budget-friendly model released in 2007, maintained the iconic swivel screen and trackball, while the Sidekick Slide offered a different sliding form factor. The original data services finally ceased on May 31, 2011, after nearly nine years of operation.

The Sidekick remains an icon of American pop culture, representing a specific era of mobile interaction. It successfully bridged the gap between the tactile utility of a keyboard and the burgeoning world of mobile internet, creating a blueprint for the social networking and app-centric experiences that dominate smartphones today.

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