Six new cellphones from Nokia, all with color screens: the tri-band 7250, which has a built-in digital camera; the 6100, the world’s smallest and lightest GPRS phone with a color display; the dual-band 8910i, which is a version of the 8910 but with a color display; the tri-band 5100, with a color; the entry-level 2100; and the intriguing 6800 (pictured at right), which flips open to reveal a full QWERTY keyboard and is designed with mobile messaging in mind.