... in 198 1 C. in 198 3 D. in the same year when AT& T constructed a cell phone system.Câu 18: When did AT& T widely start their cellular phone system? A. in 2001 B. in 197 7 C. in 198 1 ... device C. Something we use just for playing games. D. A version of walkie- talkieCâu 13: What is wrong about a walkie- talkie? A. It has one channel B. It was first designed in 197 3. C. It ... cell phone itself cost about $ 3, 500. In 197 7, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers. In 198 1, a second cellular phone system was...