When did AT& T widely start their cellular phone system? A. in 2001 B. in 1977
When did AT& T widely start their cellular phone system?
A. in 2001
B. in 1977
C. in 1981
D. 37 years after their first design
Thông tin: In 1977, AT & T constructed a cell phone system and tried it out in Chicago with over 2, 000 customers.
Chọn B