Roaming at home (with internal charge): Frequent questions

Until today, When you are traveling in another EU country, your mobile operator will charge you a different, highest price Your Mobile communications (phone calls, SMS, data) in that country.

During the last 10 years the EU has gradually demanded by mobile phone companies to significantly reduce roaming charges, Consumer. If you travel regularly to other EU countries, you may have already seen a sharp reduction of roaming prices in the last decade.
From 15 June 2017 They will disappear and the latest roaming charges still paying on your mobile operator when traveling in another EU country.

Any existing or new contract that includes roaming services will become default in contract roam like home (international roaming on domestic prices).

in more detail:

http://ec.europa.eu/greece/news/20170606_roaming_san_to_spiti_sas_faq_el