The European Commission is to force mobile operators to reduce the charges they levy against users for using their phones abroad.
Some users can be charged over £3 a minute for making a call when on a foreign network when travelling.
The European Commission is acting because the operators have failed to adequately reduce prices despite promises to the Commission that they would.
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Viviane Reding, information, society & media European commissioner, held a meeting with national telecoms regulators this week and demanded regulatory action to reduce roaming charges.
Reding is expected to announce this week that roaming charges should be capped at levels equivalent to standard domestic mobile calls between networks.
The cost of mobile data connections when roaming across different countries is also high, although the commission is not expected to act on these charges, for now.
One reason for this lack of action is that relatively few users take advantage of mobile data services over mobile networks when travelling.