Rules governing access and the exercise of the activities of provider of audiotext services and message-based valued added services

Amends and republishes Decree-Law no. 177/99, of 21 May

Subsequently amended by Law no. 95/2001, of 20 of August, Decree-Law no. 63/2009, of 10 March, Law no. 51/2011, of 13 September, and Decree-Law no. 8/2013, of 18 January.