Magnetic card phones are operated with prepaid phone cards,
Generally INSTALLED IN HOTELS, restaurants, WAITING ROOMS, STREET PHONE booths AND telecommunication halls, can be used to make local telephone, domestic and international direct dial telephone and receive incoming calls, etc.
The magnetic card is a magnetic strip attached to the surface of PVC material. Its basic working principle is the same as magnetic tape. It uses magnetization to change the magnetic strength of the magnetic strip, so as to record and modify information. Some Pr phone cards can also be operated in this way.
When the card is read, when the magnetic card passes through the working head equipped with a coil at a certain speed, the coil will cut the external magnetic inductive line of the magnetic card, and generate an induced current in the coil, thus transmitting the recorded signal.
Therefore, the magnetic card phone has the automatic billing function. Every time you make a call, the telephone can automatically change the information on the magnetic card according to the call and the call distance, so as to reduce the payment balance on the card.
During a call, if the amount left on the card is close to zero, the system will make a urging sound and a light-emitting diode flash to get the user's attention for about 20 seconds before forcing the call to be cut off.
At this point, as long as the insertion of another magnetic card, you can continue the call.