Abstract: The invention relates to a method for controlling scams in which a phone call requests a return call to a target number, comprising the following steps: collecting signalling data of phone calls made via a telephone network (2); detecting suspicious calls from signalling data collected and using a detection algorithm, and for each suspicious call detected, identifying a suspicious number; comparing the suspicious number with a number and/or at least one range of certified target numbers contained in a certification database, and defining a risk profile for the suspicious number accordingly. Methods and systems for controlling phone scams.