The T-Mobile Sidekick 4G is an Android smartphone that has a built-in QWERTY keyboard. The screen slides off onto a hinge that allows access to the keyboard. It is the first phone in the Sidekick brand to be powered by an Android OS. The phone's built-in software is designed with social media in mind, as it comes with Samsung's Social Networking Sync app. The 3.5" LCD display has a resolution of 480x800. The T-Mobile Sidekick 4G ships with a 2 GB Micro SD card for additional storage, and it can be expanded to hold a 32 GB Micro SD card.