Security management on mobile-phone communication

The cellular mobile-phone system has developed over a quarter of a century, and most features are mature, but not the security management. The security problem arises due to the popularity of the mobile-phone, and the advanced technology, because of the disclosure of information. However, the disclosure of information cannot be avoided, so, the information must be encoded before transmission. In order to distinguish between the encrypted and the original message; the extended-message field in the overhead message can be used as an indicator.