This invention relates a system, wherein virtual numbers are provided to users through Telecom or computer networks, and one-way or two-way message transmission (texts, images, music or multimedia) are achieved under the situation that message senders do not know the true call numbers of receivers. Virtual numbers are used by receivers permanently for acceptance of messages. According to the setting of users, the message senders are required to input password, thus the service is only offered to specific senders. In addition, the time for message acceptance can be set. The system can integrate accounts and message management for users.