System and method for detecting SMS parameters manipulation. A first SMS registry is coupled to a first Short Message Service Center (SMSC) and optionally to other SMS registries. The first SMSC is within a terminating telephone network. The first SMS registry receives first and second information about an SMS message that was sent from another telephone network or from an External Short Messaging Entity (ESME) and is destined to the first SMSC. The first and second information represent status of the SMS message respectively before and after the SMS message enters the terminating telephone network. The first SMS registry or a firewall automatically compares at least corresponding portions of the first and second information. As a result of the comparison, in response to detecting a difference between the at least portions of the first and second information, the first SMS registry automatically sends a signal indicating SMS parameter manipulation.