The T-Mobile Sidekick iD looks like a cross between the Sidekick 3 and the Sidekick 2. It sports the pearly white/gray coloring of the Sidekick II, but features the new navigation controls found on the Sidekick 3. At 5.1 inches long by 2.4 inches wide by 0.8 inch thick it retains the same shape as its predecessors, but at 6.2 ounces, the iD is slightly lighter than the Sidekick 3. The Sidekick iD also manages to add some flair of its own with its interchangeable bumpers. Available in black, yellow, blue, purple, or a glow-in-the-dark scheme, the bumpers (more designs are planned) add some spice to the drab gray color scheme that you get in the box. Just be aware that these accessories cost $19.95 each, which is pricey. Our review unit came with the bright-as-sunshine yellow bumpers, and swapping out the bumpers was a bit labor-intensive. There's a total of four pieces that you need to take on and off, and there's a fair amount of pulling and snapping to get them on correctly.

The Sidekick iD's screen is slightly smaller than the one found on the Sidekick 3, and displays 65,000 colors at a low 240x160 pixel resolution. Flanking the screen are the controls. To the left, you have the menu and jump buttons and a directional keypad that doubles as the phone's speakers, and on the right, there is a cancel button, Talk and End keys, an OK button, and the trackball navigator. In addition, you'll find a volume rocker, a power button, and a 2.5mm headset jack along the bottom edge of the phone, while along the top edge are two function buttons that perform different tasks depending on which application you are using. Finally, there is a power connector and a loop for the wrist strap on the right side.

The Sidekick iD's screen is slightly smaller than the one found on the Sidekick 3, and displays 65,000 colors at a low 240x160 pixel resolution. Flanking the screen are the controls. To the left, you have the menu and jump buttons and a directional keypad that doubles as the phone's speakers, and on the right, there is a cancel button, Talk and End keys, an OK button, and the trackball navigator. In addition, you'll find a volume rocker, a power button, and a 2.5mm headset jack along the bottom edge of the phone, while along the top edge are two function buttons that perform different tasks depending on which application you are using. Finally, there is a power connector and a loop for the wrist strap on the right side.