Japan's Nippon Telegraph and Telephone has developed four new palm-size cellular phones, which are displayed next to the company's standard-size model. The company says the new 8.1-ounce cellular phone can carry a continuous conversation for 45 minutes with regular batteries. The company has used new miniaturized low-power circuitry to cut the size of the phone to about 9.2 cubic inches, compared to 13.5 cubic inches for Motorola's Micro TAC telephone. The firm says the phones are the smallest and lightest in the world.