Fifty-two years ago today, on April 3, 1973 (March 1, 1973 in the lunar calendar), the world's first mobile phone was born. Martin Cooper, the inventor of the mobile phone, opened the world's first mobile phone in 1973. On April 3, 1973, a burst of warm applause erupted in Motorola's laboratory in Manhattan, new york. "We made it!" The researchers in the lab cheered. Martin Cooper, the leader of the research team, held up their research results-the world's first mobile phone-and asked excitedly, "My dear friends, I'm going to go out on the street and use this phone to call someone. Guess who it is?" "Your family?" "Your friends?" The people present speculated. "No, you all guessed wrong." Cooper smiled mysteriously. Then he walked out of the lab and onto the streets of Manhattan. People who passed by him all stopped, stared at the wireless phone in his hand, and stopped to wait and see. Before that, people had never seen a phone without a rope. Cooper pressed a string of telephone numbers as everyone watched. The call went on and a man's voice came from the other end: "This is Joel Engel." Cooper said excitedly in an almost trembling voice: "Yul, I'm talking to you on a real mobile phone, a real mobile phone!" Silence went on the other end of the phone. It was none other than Yul Engel, a scientist at Bell Labs, Cooper's longtime competitor, who answered the phone. Cooper is holding DynaTAC, the world's first mobile phone. Compared with today's mobile phones, this mobile phone is bulky and messy-there are 30 internal circuit boards, the talk time is only 35 minutes, but the charging time is 10 hours, and it only has two functions: making and receiving calls. But at that time, the birth of this mobile phone meant the beginning of a new era-the birth of wireless communication. Martin Cooper, the inventor of the mobile phone, opened the world's first mobile phone in 1973.