This is like dividing a highway into 10 lanes and allowing only one car to drive on each lane. The frequency band assigned to each mobile phone represents the amount of data the mobile phone can send per second and every minute. However, the frequency band of mobile phone radio waves is as precious as gold. This invisible and intangible highway is actually not wide and cannot be allocated to so many mobile phones.
So people have thought of various ways to solve this problem, including various communication technologies such as 2G and 3G that people often hear about. If enough frequency bands are allocated to each mobile phone, there will be no interference between mobile phones and mobile phones. However, no matter how the limited frequency bands are divided, it is still impossible for all mobile phones in a city to use them at the same time. then what should we do?