Electronic and Postal Communications (Mobile Number Portability) G.N. No. 422 (contd) Cap. 172 portability, whereby a network operator makes copies of central data base of ported numbers and queries it to find out which network to send a call to; “Authority” means the Tanzania Communications Regulatory Authority (TCRA) established under the Tanzania Communications Regulatory Authority Act; “CDMA” means Code Division Multiple Access technology; “donor” means the provider of public telephone services whose subscriber or former subscriber wants to use or uses the services of another provider of public telephone services in retaining the subscriber number, which was or is used to receive electronic communication services of the donor; “electronic communication number” means the number, sign or other mark which an electronic communication operator uses in its delivery of electronic communication services for identification of electronic communication facilities in order to connect between the place of transmission and the place of reception or for identification of the type of content of transmission to be delivered by the electronic communication facility; “electronic communication operator” means any person licensed by the Authority to provide electronic communication services; “GSM” means Global System for Mobile communications technology; “licensee” for purposes of these Regulations means provider of public land mobile network services; “mobile number portability” means the customer’s retention of his mobile number(s) as he changes from one mobile service provider to another; “national numbering plan” means the plan for electronic communications numbers as maintained by the Authority; “national significant number” means the number to be dialled following the national (trunk) prefix to obtain a subscriber in the same country or group of countries included in one integrated numbering plan but outside the same local network or numbering area; “number portability clearinghouse” means a centralized automated 94