The Software of SMS Firewall on iPhone OS
With the widespread use of smart phones in current social, the SMS chat has become a new way of communication among people. However, a variety of advertising, recruitment and some unwelcome sexy messages are being sent to people’s phone. SMS Firewall is a kind of filter software that can obstruct SMS which you defined as harassment. The paper describes how to achieve this function on iPhone OS with some tools like class-dump, Xcode and MobileSubstrate.
Z. F. Luo and S. X. Wu, "The Software of SMS Firewall on iPhone OS", Advanced Materials Research, Vols. 268-270, pp. 1433-1437, 2011