The T-Mobile Sidekick’s Jump button made mobile multitasking easy

Photo by Sean Hollister / The Verge

Before the iPhone, before Android, before webOS, a revolutionary soap bar of a phone made it incredibly easy to get shit done. The Danger Hiptop, better known as the T-Mobile Sidekick, made the internet portable and affordable like no phone before.

It introduced cloud sync long before iCloud, popularized unlimited data and real web browsing on mobile, and made instant messaging and email a breeze thanks to its landscape hardware keyboard.

But the Sidekick doesn’t get enough credit for one physical button that tied the whole phone together: the Jump key.

Photo by Sean Hollister / The Verge
Most remember the swiveling screen, but there was much more to a Sidekick.

On modern phones, opening an app usually means…