Fresh from its victory to cap mobile roaming charges for data and text messages, the European Commission’s campaign against “rip-off” mobile telephone charges has a new target: mobile termination rates.

EU telecoms commissioner Viviane Reding has authored a set of guidelines asking national telecoms regulators of the 27-country bloc to take action against termination rates, the wholesale fee that carriers charge one another to route calls. Reding wants to see the rates fall by some 70 percent which could shave some 2 billion euros off consumer bills.

According to the Commision, mobile termination rates—or what Competition Commissioner Nellie Kroes referred to as their “cash cow”—are typically 10 times higher than fixed line termination rates, and vary widely across the EU, costing anywhere from 2 euro cents a minute in Cyprus to 15 euro cents a minute in Bulgaria. The termination rates are bad news for consumers, which the Commission noted amounted to a hidden charge on their bills. Moreover, it stifles competition by making it harder for smaller carriers and fixed line operators to compete with larger carriers—something the smallest UK carrier Three has been complaining about for years. In a statement, the Commission said, “They are an indirect subsidy that benefits mobile operators with a large market share to the detriment of smaller and fixed-line operators.”