T-Mobile Sidekick (Danger Hiptop)

Built by Danger Inc. and sold through T-Mobile from 2002, the Sidekick (originally the Hiptop) had a screen that swiveled open to reveal a full keyboard beneath. Its always-on internet, instant messaging, and playful interface made it a cult favorite, especially in youth and hip-hop culture.Colorful, distinctive, and now firmly nostalgic, working Sidekicks are a highlight for any early-2000s phone collection.