T-Mobile Sidekick (2002)

Also known as the Hiptop, this legendary smartphone was born out of Danger Research, a group formed from Apple talent that wanted to make the mobile phone as much like a computer as possible. Their creation was a fascinating phone with a screen that could flip up and out to expose an internal keyboard. The large screen was ideal for online activities like instant messaging and web surfing, and the unique design caught attention quickly.

The phone was first released in 2001, but was repackaged a year later by the company that had just become T-Mobile, under the new name Sidekick. This phone would ultimately have several different variations, some including a camera for video chatting, and celebrities were known to show them off. The Sidekick also introduced one of the common phone problems of that era: It was just too heavy.