Methods and systems of filtering spam messages for cellular network subscribers are provided that may include receiving a message from a decoy subscriber number. The method and systems may further be adapted to determine whether the message at the decoy subscriber number may be spam. If the message at the decoy number tends to be spam, the message may be output to a filtering service for further analysis. In the final analysis if a message is determined to be spam, then new rules may be created and distributed to front end spam and/or virus engines to restrict such traffic from reaching subscribers.