# The Data Retention Regulations 2014, Paragraph 9: Data necessary to identify users’ communication equipment (or what purports to be their equipment)


(1) The International Mobile Subscriber Identity (IMSI) and the International Mobile Equipment Identity (IMEI) of the telephone from which a telephone call is made.
(2) The IMSI and the IMEI of the telephone dialled.
(3) 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.

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Source: https://www.legislation.gov.uk/ukdsi/2014/9780111118894/schedule/paragraph/9 (the official version)
Page: https://openlegislation.uk/draft-data-retention-regulations-2014/schedule/paragraph-9
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.