Like the Sanyo SCP-3100, the SCP-2400 has the appearance of a child's toy. Its plastic exterior and large speaker grille scream kid-size walkie-talkie. At 3.3 by 1.8 by 1.0 inches and 3.5 ounces, it fits in a purse without a problem, but it fits rather tightly in a pants pocket. Opening the clamshell takes a negligible amount of effort, and it cradles comfortably next to the ear.
Right beneath the speaker grille is the 1-inch-diagonal monochrome external screen that has an orange backlight when activated. It displays the signal and battery strength, the time, and caller ID. On the left spine is the headset jack, a voice-recording key that doubles as the Ready Link key, and the volume rocker. The SCP-2400 has an extendable antenna as well.
Open up the phone, and you'll find a rather disappointing 65,000-color, 1.75-inch-diagonal display. Colors appear washed out, and the screen is difficult to see in bright sunlight. You can adjust the backlight timer of the internal display, the keypad, and the external screen. The font size, the default greeting, the background, contrast, the background color for incoming calls, and the sleep-mode timer are adjustable to suit your preference.
The navigational controls and keypad layout are very similar to those of the SCP-3100. There are the two soft keys, a five-way toggle that doubles as shortcuts to messaging, the phone book, the My Content folder (a list of games, ring tones, screensavers, applications, IM and e-mail, and call tones), and the My Favorites folder (a "smart" list of shortcuts to frequently used features). Underneath the left soft key is the Web browser button, and underneath the right soft key is the Back button. We found this arrangement a little odd, and we found ourselves accidentally hitting the Web button when we meant to make a call because it is located where the Talk key usually is. Below those are the Talk, Speakerphone, and End/power keys, followed by the keypad. The keys have a greenish backlight when activated.