| 摘要 |
Method and apparatus for authorizing a calling card telephone call are de scribed. In one example, a telephone calling card includes a planar body hav ing a memory system, an input circuit, a controller, and a display. The memo ry system is configured to store key code information. The input circuit is configured to receive a personal identification number (PIN). The controller is configured to derive a key code from the key code information using the PIN. The display is configured to present the key code. The user may then us e the key code for purposes of authorizing a call made using a calling card. The key code may change from time-to-time as the user uses the calling card . Since the user's PIN is not entered into a telephone by the user, the call ing card is less susceptible to unauthorized and/or fraudulent use by third parties.
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