Article 68. A provider of publicly available telephone services shall ensure that end users, including end users using public pay telephones, are given the possibility to connect with a service provider's consultant, including in order to obtain information on alternative tariff options, if these are available. Article 69. A subscriber to a publicly available telephone service may request the change of an assigned number, if he/she proves that using an assigned number causes nuisance. Article 70. In the event of a change in the place of residence, seat or place of activity, a subscriber being a party to an agreement concluded in a written or electronic form with a service provider which provides connection to a public telecommunications network of an operator and using an assigned number from the national numbering plan may request the porting of an assigned number within an existing network of the same operator in the area: 1) with the same geographic area code – for geographic numbers; 2) the entire country – for non-geographic numbers; Article 71. 1. A subscriber being a party to an agreement where a number from the national numbering plan is assigned to that subscriber may request, when changing service providers, to port the assigned number to an existing network of an operator in: 1) a geographic area – for geographic numbers; 2) the entire country – for non-geographic numbers. 1a. (deleted). 2. The provision of paragraph 1 shall not apply to porting numbers between fixed and mobile public telecommunications networks. 2a. Exchange of information between service providers with respect to handling number portability requests shall be conducted electronically via the system referred to in Article 78 (4). 3. A subscriber shall not be charged any fees for porting an assigned number. 4. The President of UKE shall maintain a database of ported numbers referred to in paragraph 1. The database shall be part of the system referred to in Article 78 (4). 5. An operator of a public telecommunications network with a numbering assignment from the national numbering plan as well as on operator to whom numbering was made available based on an agreement referred to in Article 128 shall be obliged to connect this network directly or via a public telecommunications network of another operator with the database referred to in paragraph 4. An operator of a public telecommunications network with a numbering assignment from the national numbering plan as well as on operator to whom numbering was made available based on an agreement referred to in Article 128 shall be obliged to systematically update the database referred to in paragraph 4. 6. The President of UKE, based on data included in the database referred to in paragraph 4, may enable that it is possible, on the UKE website, to identify the provider of services for a particular number in a public telecommunications network. Article 71a. A subscriber referred to in Article 71, when requesting to port an assigned number may terminate an agreement with the existing service provider without the observance of terms of notice specified in the terminated agreement. In such a case the subscriber shall be obliged to pay the charge to the existing service provider in the amount not exceeding subscription fee for a notice period, however not higher than the subscription fee for one settlement period increased by a claim linked to an allowance granted to the subscriber calculated in proportion to the time that remains to agreement termination.