| 摘要 |
A communication device having a secret mode enters the secret mode in response to receiving a secret mode access key. In the secret mode, the communication device receives a first instruction to handle a covert communication source in the secret mode. The communication device receives a second instruction to exit the secret mode. After exiting the secret mode, and in response to the first instruction, the communication device provides a covert communication alert for an incoming communication from the covert communication source. The communication device provides overt communication alerts for incoming communications from overt communication sources. |
