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

Extent: E+W+S+N.I.

(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/uksi/2014/2042/schedule/paragraph/9 (the official version)
Page: https://openlegislation.uk/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.