In yet another attack on mobile operator tariffs, the EU Telecoms Commissioner, Viviane Reding, says she plans to publicly name those that do not lower their roaming text message and wholesale data transmission prices by July 1st 2008.

“I will look at all the tariffs available and put them on a website,” she told Reuters. “That way, people will be able to see which ones have not lowered their prices.” Reding is asking operators for the price of a text message sent outside one’s home country to be capped at €0.12, down from the current average of €0.29 in Europe and €0.23 in France.

According to the Commissioner, some operators charge up to €11 per megabyte of data transmitted outside their home country but most charge between €5 and €7. She would like to see those roaming wholesale prices slashed to €0.35 per megabyte.

Poland’s Play, Dutch-based KPN and 3 Group already charge just €0.25 per megabyte of data transmitted outside one’s home country, while others, including Vodafone, Deutsche Telekom and KPN have already announced cuts in their data roaming prices, the Commissioner said.

Separately, the Financial Times reports that the Commissioner has suffered a setback in her ambitions to create a European-wide ‘super regulator’ after a paper criticising the proposal was presented by the Spanish conservative MEP, Pilar del Castillo. The document is seen as particularly damaging as the author is the MEP charged with steering Ms. Reding’s plans through the EU.