Communications 2003 No. 19 A 327 (c) operator assistance services ; and (d) services for disabled consumers. (3) The Commission shall, in specific regard to emergency services, take immediate steps upon the commencement of this Act to : (a) promote and enhance public safety through the use of a particular number which shall be designated as the universal safety and emergency assistance number for telephone services generally ; and (b) encourage and facilitate the prompt deployment throughout Nigeria of a seamless, ubiquitous and reliable end-to-end infrastructure for emergency communications needs. (3) The Commission may determine the classes of network service providers who shall provide any or all of the applications services on the list of required applications services and shall direct them to provide the required applications services. (4) Notwithstanding any provision to the contrary in this Act or any instrument made, issued or given under this Act, a direction by the Commission issued under subsection (3) of this section may provide for or specify operational details relating to a required applications service. PART III—TARIFF RATE REGULATION 108.—(1) Holders of individual licences shall not impose any tariff or charges for the provision of any service until the Commission has approved such tariff rates and charges except as otherwise provided in this Part. (2) The licensees specified in subsection (1) of this section shall provide services at the tariff rates and charges so approved by the Commission and shall not depart therefrom without prior written approval by the Commission of such proposed changes in tariff rates and charges. (3) All licensees mentioned in subsection (1) of this section shall publish the tariff rates charged to customers for their respective services and the modifications thereto as may be approved from time to time by the Commission. (4) The tariff rates established by a licensee mentioned in subsection (1) of this section shall be on the basis of such principles as the Commission may from time to time stipulate in its guidelines or regulation including the following— (a) tariff rates shall be fair and, for similarly situated persons not discriminatory ; (b) tariff rates shall be cost-oriented and, in general, cross-subsidies shall be eliminated ; (c) tariff rates shall not contain discounts that unreasonably prejudice the competitive opportunities of other providers ; (d) tariff rates shall be structured and levels set to attract investments into the communications industry ; and (e) tariff rates shall take account of the regulations and recommendations of the international organisations of which Nigeria is a member. Approval of tariffs and charges by Commission.