5. Data to be retained
(1) The following data concerning fixed network telephony and mobile telephony generated in the United Kingdom must be retained in accordance with regulation 4(1):
(a) the telephone number from which the telephone call was made and the name and address of the subscriber and registered user of that telephone;
(b) the telephone number dialled and, in cases involving supplementary services such as call forwarding or call transfer, any telephone number to which the call is forwarded or transferred, and the name and address of the subscriber and registered user of such telephone;
(c) the date and time of the start and end of the call; and
(d) the telephone service used.
(2) The following data concerning mobile telephony must be retained in accordance with regulation 4(1):
(a) the International Mobile Subscriber Identity (IMSI) and the International Mobile Equipment Identity (IMEI) of the telephone from which a telephone call is made;
(b) the IMSI and the IMEI of the telephone dialled;
(c) in the case of pre-paid anonymous services, the date and time of the initial activation of the service and the cell ID from which the service was activated;
(d) the cell ID at the start of the communication; and
(e) data identifying the geographic location of cells by reference to their cell ID. |