Patent ID: 7979082

Claim:
A method of identifying an unwanted short message service (SMS) message from SMS messages received by a cellular mobile communication system, which comprises at least a history database (HB) for storing a set (H) of the messages received by the cellular mobile communication system, the method comprising the steps of: comparing contents of an incoming SMS message (m) to the contents of a set (H) of stored messages stored in a history database (HB) to determine similarity between the incoming message and the stored messages; measuring a difference in an information content between an SMS message (m) received by the cellular mobile communication system and the set (H) of messages stored in the history database (HB), and identifying the incoming message as spam and marking the SMS message (m) as being an unwanted SMS message if the difference that is measured is less than or equal to a predefined threshold value, whereby spam is identified even when the contents of an incoming message do not exactly match any predefined spam terms.