A method and system for the prevention of unwanted wireless telecommunications, which is implemented as part of a computer program product in (preferentially) the telecommunications operator's network. The method and system meets and/or exceeds much of current, proposed, and even academically anticipated legislative (and by necessity, technical) criteria, and thus the broader body of consumer requirements associated with wireless telecommunications spam filtering. Indeed, the method and system provides for a remarkably flexible and customizable advance in the art through the utilization of a progressive filtering algorithm. This algorithm offers both the subscriber and the service provider with the capability to block and/or extract potentially harmful or unsolicited SMS, MMS and other such messages on the basis of an extensive range of parameters and rules.