A mobile communication device includes a receiver, a buffer, a memory, an identifier, and a deleting module. The receiver is used for receiving short message service messages. The buffer is used for storing the short message service messages temporarily. The memory is used for storing a plurality of contact records. The identifier is used for identifying the short message service messages based on the contact records. The deleting module is used for deleting the short message service messages from the buffer if the short message service messages don't pass the identifying action. A mobile communication method is also disclosed.