accordance with the procedure referred to in Article 90 of this Act. Article 138 (additional facilities and obligations) If the Agency, after consultation with interested parties, establishes that the facilities listed below are not provided to a sufficient extent or that the obligations are sufficiently met in the entire territory of the Republic of Slovenia or in a part thereof, it may, by means of a general act, lay down that undertakings that provide publicly available telephone services or access to a public communications network: 1. enable tone-dialling or the presentation of calling-line identification, if this is technically and economically feasible; 2. enable all or some of the cost-monitoring options referred to in the seventh paragraph of Article 120 of this Act, including the option of controlling costs for data services; 3. meet the obligations referred to in Article 122 of this Act. Article 139 (itemised billing) (1) All subscribers to publicly available telephone services shall have the right to receive unitemised bills. (2) If a provider of publicly available telephone services offers an itemised billing service under its general terms and conditions or the general act referred to in the previous Article, the provisions of Article 121 of this Act shall be applied mutatis mutandis to this service. (3) All itemised billing offered by an operator which exceeds the basic level of itemised billing referred to in the first paragraph of Article 121 of this Act must be defined in the general terms and conditions. If an operator offers such itemised billing against payment, the prices must be set at the level of the actual costs incurred by the operator from the requested additional itemisation. This aforementioned shall not affect the possibility for other users and subscribers to pay separately for individual services, where technically feasible, and in such instances they shall not be included in the itemised bill. (4) An operator shall, at the request of a subscriber to publicly available telephone services, issue an itemised bill referred to in the preceding paragraph with a level of itemisation of called numbers that guarantees protection of the privacy of calling users that are legal entities and of called subscribers by deleting or concealing the last three digits of a number called. An operator shall not be required to conceal called numbers: 1. in an itemised bill for calls between telephone numbers of the same subscriber; 2. if the subscriber is a consumer; 3. if the subscriber is a natural person or legal entity that performs a commercial or other activity in the market and they request an unconcealed itemised bill and enclose with the request a document showing to which user the number for which they are requesting an itemised bill has been allocated and the user’s consent to disclosure of the called numbers stating that it has been given in order to provide grounds for exceeding the costs of a company telephone that had been agreed upon. An operator shall send the itemised bill to the user, who may conceal the telephone numbers called for private purposes on the bill. (5) An operator must retain a request relating to the sending of itemised bills with unconcealed called numbers in accordance with point 3 of the preceding paragraph for one year following the day the bill was sent and submit it to the competent authorities for inspection at their request.