Abstract: A system for detecting fraud in international telecommunication traffic, includes: a transactions registry accessible by multiple operators and/or carriers; a logging module installed with multiple operators and/or carriers configured to add an entry in the transactions registry by an operator and/or carrier handling a call, wherein an entry comprises the calling number, the called number and timing information for the call; a fraud detection and classification module configured to: select from the transactions registry a group of correlated entries representing the call; compare the correlated entries to detect an anomaly due to fraud and to classify the call into a fraud type.

Abstract: A method to detect spam SMS messages including unsolicited repeated SMS messages originating from or sent to one or more subscribers of one or more mobile communication networks, comprises: clustering messages in similarity clusters, wherein each similarity cluster comprises SMS messages with identical or similar content; counting an amount of SMS messages in each similarity cluster; monitoring a rate of SMS messages in each similarity cluster; and classifying SMS messages of a similarity cluster as spam when the amount of SMS messages in the similarity cluster exceeds a certain first threshold and the rate of SMS messages for the similarity cluster exceeds a certain second threshold.