An apparatus with a first receiver for receiving changing information relating to a plurality of different sets of data such as financial data and a second receiver for receiving the changing information in synchronism with the first receiver. A data base is provided to store information received by the first receiver. A subscriber profile store stores information associating a subscriber with a group of the different sets of data. The apparatus is arranged to supply, via a mobile telecommunications network, information from the data base for the group of data sets associated in the subscriber profile store with a subscriber when communication with that subscriber is first established and thereafter to supply changing information relating to the group of data sets associated with that subscriber directly to the subscriber from the second receiver.