Germany's antitrust authorities launched an investigation into whether Deutsche Telekom wireless unit T-Mobile and Vodafone have abused their dominant market positions there, Dutch telecoms carrier KPN said.
In a Reuters report, KPN also said the Federal Cartel Office in Germany began its proceedings after KPN complained.
Germany's Cartel Office was not immediately available for comment.
Separately, Belgium's competition watchdogs have found that the country's dominant carrier, Proximus, also abused its dominant market position, the Reuters report said.
The Reuters report further said KPN chief Stan Miller saying that 'the actions now taken by the competition authorities both in Germany and Belgium confirm our belief that the dominant providers are engaging in anti-competitive behavior on both the Belgian and German markets,'
'Over the past years KPN, E-Plus and BASE had repeatedly demanded corrective action against the abusive behavior of certain operators on the German and Belgian mobile communications markets, which affects not only competition, but also consumer interests,' KPN said.
The company said this relates to discussions on mobile termination rates, the allocation of frequencies and pricing for fixed to mobile connections.
KPN owns mobile networks in the Netherlands, Germany and Belgium.