The Sidekick 3 includes many features that are new to this line of cellular-wireless handhelds. Although the Sidekick 3 has the same general shape as its predecessors, it is 20 percent smaller than the previous models. It also a new trackball for easier one-handed navigation and Bluetooth for wireless headset use. This is also the first Sidekick to include an MP3 player, removable battery, and miniSD card slot for expandable memory. This handheld also includes a 1.3 megapixel camera with supplemental LED flash. Naturally, this device runs on T-Mobile’s GSM/GPRS network, and it has support for that carrier’s EDGE network.