Electronic and Postal Communications (Central Equipment Identification Register) G.N. No. 417 (contd) boundary; “Network Service Licensee” means a holder of a network service licence; “Report Book” “in its abbreviation RB” means the report as applied to the procedures of the Tanzania Police Force which include the reference number for reported lost, found or damaged telephone;; “subscriber” means a person who receives a network service under an agreement with or pursuant to terms and conditions established by a network service licensee; “white list” means any unique pairs of subscriber number and IMEI numbers as captured by a licensee of electronic communication service where IME or ESN is not in the black list; “whitelisting” means to activate a new or re-activate a once stolen or lost mobile telephone for accessing network services of the network services licensees after the said mobile telephone has been recovered. PART II THE EQUIPMENT IDENTIFICATION REGISTERS Powers of the Authority 4. The Authority shall maintain and control the Central Equipment Identification Register (CEIR) by(a) ensuring that it is kept up-to-date all the time; (b) ensuring that it is in-line with the national electronic communication numbering register; and (c) ensuring that all IMEI or ESNs entries are maintained. 28