The Commission shall submit to the European Parliament and the Council, not later than three years after the date referred to in Article 17(1), a report on the application of this Directive and its impact on economic operators and consumers, in particular as regards the provisions on unsolicited communications, taking into account the international environment. For this purpose, the Commission may request information from the Member States, which shall be supplied without undue delay. Where appropriate, the Commission shall submit proposals to amend this Directive, taking account of the results of that report, any changes in the sector and any other proposal it may deem necessary in order to improve the effectiveness of this Directive.