Abstract With the popularization of the public IC card telephone, the dial, charging functions' test of the telephone attracts people's attention more and more. This paper shows a king of the public IC card telephone detector based on the microprocessor plus the peripheral function module, both formed the hardware of the IC card telephone detector. Then design the corresponding software of the structure according to the function module. This detector have been used by some telecom bureau, which takes convenience to the telecom bureau and benefits to the consumer. Its application proved that the detector had these characteristics, for example, friendly interface, simple operations, the full functions and convenient detection.
