union-wide roaming
as defined in Regulation (EU) No 531/2012 of the European Parliament and of the Council of…, Article 2(2), point (f) (Definitions)
the use of a mobile device by a roaming customer to make or receive intra-Union calls, to send or receive intra-Union SMS messages, or to use packet switched data communications, while in a Member State other than that in which the network of the domestic provider is located, by means of arrangements between the home network operator and the visited network operator