A method of passing location data within a communication network to a third party is provided. The location data is indicative of a geographical position of a mobile telecommunications device. The method includes the steps of determining the location data associated with the telecommunications device, receiving from the mobile telecommunications device an access request including a destination application and a unique identifier of the mobile telecommunications device, determining an alias identifier for the mobile telecommunications device, replacing the unique identifier in the access request with an alias identifier for the telecommunications device, forwarding the access request to the destination application, and forwarding the location data with the alias to the destination application. The destination application is then able to associate the access request with the location data.