- 18 - The Ministry shall publish instructions explaining the procedures of obtaining the approval to import telecommunications devices and equipments to the Authority, their use, trading thereof, as well as the requirements for those approvals. Chapter Eight Establishment, Exploitation and Maintenance of Phone Lines and Telecommunications Equipment Article 42 Phone telecommunications network shall include all installations, equipment and tools set up aboveground or underground to ensure phone telecommunications in the perimeter of the Authority. Article 43 The Ministry may: 1. Set up, aboveground or underground, on the public roads and subroads, all the necessary telecommunications works and maintain them; 2. Erect pillars and ground cables tunnels on unfenced land; 3. Establish the lines and install switches on common areas in the built property, provided they are accessible from outside, in order to connect the dwellers of the building or the adjacent buildings, individually or collectively, with the main distribution network. Article 44 Such works shall be free of charge, conditions and agreement with the proprietors, who shall be informed, by registered letter, 15 days before the start of works.