Mobile phone operators in the European Union are keeping charges for roaming as high as regulations will allow them, showing that there is a need for more competition, the European Commission said in a report published Tuesday.

When mobile phone subscribers travel outside their home country, network operators apply roaming charges for calls made or received on foreign networks, and for messages and data traffic sent. Since 2007, the Commission has set caps for the price of calls made by mobile subscribers from one E.U. member state roaming on a network in another member state.