| 摘要 |
A computer may be provided with a wireless communication capability by connecting a communication device to the computer through a cable connection. The communication device may provide the computer with a communication connection to a mobile telecommunication network. When a cable connecting the communication device to the computer is removed, the communication device detects a disconnection between the communication device and the computer. Consequently, the communication device starts a timer upon detection of the disconnection and performs an operation to deregister the communication device from the mobile telecommunication network after the lapse of a pre-determined time period counted by the timer. Accordingly, the communication device does not immediately deregister itself from the mobile telecommunication network when it detects the disconnection. Instead, the communication device allows a user to reattach the cable within the pre-determined time period. Thus, unnecessary signaling between the communication device and the mobile telecommunication network is avoided.
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