OBS_VALUE: <ul><li><a href=https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:02012R0531-20170615 target=_blank>Regulation (EU) No 531/2012.Last amended by the EU Regulation 2017/920.(Regulation (EU) No 531/2012 of the European Parliament and of the Council of 13 June 2012 on roaming on public mobile communications networks within the Union. Last amended on the 17 of May 2017 by the EU Regulation 2017/920. Article 6a. )</a></li></ul>