How to block some harassing mobile phone numbers on fixed telephones?

Ordinary fixed telephones don't have the function of shielding harassing calls. Buy a phone with anti-harassment function.

Fixed telephone is one of the important modern communication means. The current and voltage on the telephone line are modulated by the microphone in the telephone through the vibration of sound, that is, the sound is converted into a voltage signal and transmitted to the other end of the telephone through the telephone line, and then the voltage signal is converted into a sound signal by the microphone.

Because it is usually fixed in one place, the scientific name is fixed telephone, which is also commonly known as telephone landline. There are several kinds of this kind of telephone, such as fax telephone and mother-child telephone. Today's fixed-line telephones don't need so much trouble. Just pick up the microphone and dial. The landline is no longer fixed.

After the reform and opening up, the backward communication network has become the bottleneck of economic development. Since the mid-1980s, the government of China has accelerated the construction of basic telecommunication facilities. By March 2003, there were 225.626 million fixed telephone users and 22 1.49 1 100 million mobile telephone users.

At all times, many people are trying to transmit information faster and better. During the telecom development of 100 years, people tried various communication methods: the original telegraph used a similar "digital" expression to transmit information.

So there appeared a telephone that used analog signals to transmit information; With the development of science and technology, the digital model has been paid attention to again with its obvious advantages. The historical wheels of digital program-controlled switching, digital mobile phone and optical fiber digital transmission are still advancing.