34 No. 3 Electronic and Postal Communications 2010 content services which they provide to the public, set and revise such prices as they deem appropriate. (2) The prices so determined by an electronic communications licensee shall respect the following principles (a) be transparent, based on objective criteria, and nondiscriminatory; (b) not contain discounts that unreasonably prejudice the competitive opportunities of other licensees providing applications services and content services to the public; and (c) take account the regulations and recommendations of the international organizations of which the United Republic is a member. (3) Each electronic communications licensee shall(a) file with the Authority the prices so determined at least two weeks prior to their introduction; and (b) publish the prices at its own expense in the public media at least one week prior to their introduction. (4) An electronic communications licensee shall provide all its application services and content services in accordance with the prices filed with the Authority. (5) The Authority shall be entitled to carry out reviews of the prices referred to in this section in order to ensure that they respect the principles set forth in sub-section (2). (6) Electronic communications licensees shall, for the application services or content services which they provide to the public, make sufficient detailed billing information to enable customers to verify whether or not they have been billed correctly. (7) The Authority shall have powers from time to time to carry out reviews of rates and charges applied by electronic communications service licensees in provision of the licensed services.