5. The Minister competent for digitalization shall indicate, by means of an announcement, IT systems ensuring credibility and authorisation of their users referred to in paragraph 3 (2) (d). Article 61. 1. A provider of publicly available telecommunications services shall determine the prices for telecommunications services, unless otherwise provided for in this Act. 2. The prices of telecommunications services shall be determined based on transparent, objective and non-discriminating criteria. 3. A provider of publicly available telecommunications services shall specify, in the tariff pages for telecommunications services, hereinafter referred to as the “tariffs”, the prices for connection to the network, for services, for maintenance and detailed information concerning applicable price options and discounts. 4. The tariffs shall be announced publicly by a provider of publicly available telecommunications services, as well as delivered to the subscriber who has made available his/her data referred to in Article 60a (1a), free of charge with the conditions of an agreement or with an agreement, if concluded by the parties in writing, for the provision of publicly available telecommunications services, including connection to a public telecommunications network, as well as at every request from a subscriber. 5. A provider of publicly available telecommunications services shall deliver to the subscriber who has made available his/her data referred to in Article 60a (1a), the contents of each modification to the tariffs at least one month prior to the introduction of these modifications and shall announce them publicly, unless the subscriber made a request referred to in paragraph 5a. This period may be shorter if the publication of a legal act based on which it is necessary to introduce modifications takes place with a notice period shorter than one month before that act's entry into force or such a period results from a decision of the President of UKE. At the same time the subscriber should be informed of the right to terminate an agreement if he/she does not accept modifications to the tariffs, while the time limit for exercising this right may not be shorter than by the date on which these modifications enter into force. 51. Where a proposed modification to the tariffs results directly from modifications to the provisions of law, causes reduction in the prices for telecommunications services, addition of a new service or results from a decision of the President of UKE, a provider of publicly available telecommunications services shall announce publicly the text of proposed modifications, at least one month before these modifications are introduced. This period may be shorter if the publication of a legal act based on which it is necessary to introduce modifications takes place with a notice period shorter than one month before that act's entry into force or such a period results from a decision of the President of UKE. At the same time the subscriber should be informed of the right to terminate an agreement if he/she does not accept these modifications, while the time limit for exercising this right may not be shorter than by the date on which these modifications enter into force. 5a. At the request of a subscriber who has made available his/her data referred to in Article 60a (1a), a provider of publicly available telecommunications services shall provide the contents of each proposed modification to the tariffs, electronically to an electronic mail address indicated for this purpose by the subscriber or by similar remote communications means. 6. In the event referred to in paragraph 5 and 5a subscribers should also be informed that in the event of exercising the right to terminate an agreement if they do not accept price increases, the provider of publicly available telecommunications services shall not be entitled to the recovery of an allowance referred to in Article 57 (6). 6a. The provision of paragraph 6 shall not apply if modifications referred to in paragraph 5 are necessary to be introduced as a result of changes to the law.