A method for managing an unallocated telephone number in a communication network, the telephone number being previously allocated to a user of the communication network until a suspension date. The method is implemented by an item of equipment of the network and includes: obtaining information relating to a call set-up request received by the communication network to the telephone number during an observation period of time subsequent to the suspension date; updating, according to the information relating to the call set-up request, information relating to an activity level of the telephone number in the communication network, the information relating to an activity level being representative of a number of requests to set-up a call to the telephone number received by the network for the given observation period and storing in a data table the information relating to an activity level of the telephone number in association with the telephone number.

A system and method for deactivating telephone numbers are presented. The method includes, in response to a request to deactivate a telephone number, communicating a query to a blockchain for the telephone number, wherein a block on the blockchain identifies an organization that had sent a previous message to the telephone number. The method also includes determining, based on a response to the query, the organization and generating and activating a filter configured to stop a future message sent by the organization to the telephone number.

The invention concerns a method and system for determining a mobile network operator identifier in relation to a mobile device subscriber number and a telecommunications network event, the telecommunications network event comprising a call set-up initiated by a first mobile device having an associated first mobile device subscriber number to connect to a second mobile device having a second mobile device subscriber number, the call set-up comprising sending a request to a portability server, the portability server sending a response formatted according to a predetermined format depending on a type of cellular technology. The determination comprises analyzing the response and extracting an identifier of the mobile network operator associated to the second mobile device subscriber number, and storing, in a dedicated storing structure, an association between the mobile network operator identifier and the second mobile device subscriber number of the second mobile device.