Display and Interface
At the heart of the C390 is its CSTN display, capable of showing 65,000 colors. The resolution stands at 128 x 128 pixels, which was fairly standard at the time, offering crispness sufficient for basic phone functions. Although the interface allows for some personalization with downloadable screensavers and wallpapers, it is limited by modern standards. The display is square with a 1:1 ratio, accommodating five lines of text.