April 3 marked 50 years since the world’s first cellphone (手机) call was made in New York. Martin Cooper, who made the call in 1973, was the engineer with US telecommunications (电信) company Motorola. The phone he used at that time was bulky (大块头的) and heavy. With an antenna (天线) poked from the top, it had two rows of numbered buttons (按键) between the ear and mouthpiece.