Wired telephone principle How to connect with a mobile phone without a telephone line?

Principle of wired telephone: telephone communication is a communication technology that uses electricity as the medium and transmits language through the mutual conversion of acoustic energy and electric energy. The simplest way for two users to communicate is to connect two phones with a pair of wires.

Wired phones don't want to connect with mobile phones: mobile phones-base stations-mobile switches-telecom switches-fixed phones, satellites and electromagnetic waves are also a kind of mobile communication, which are generally used in scientific research and national defense.

Mobile phone is the common name of mobile phone. It is a communication tool for information exchange by transmitting and receiving high-frequency radio waves or microwave signals, so it does not need a telephone line and can be carried around.

In fact, the mobile phone is a small radio transceiver. When the user dials, the mobile phone will convert this set of digital information into radio waves and send them out. After receiving this set of information, the mobile phone base station will send it to the radio switch for processing. If the other party is a wired telephone, this group of information is "handed over" to the wired telephone exchange of the telephone office, so that the two parties can talk with wired lines through radio waves; If the other party is also using a mobile phone, the switch will be connected to another radio tower, and both parties can talk through radio waves.