The Federal Trade Commission, in its ongoing effort to crack down on mobile phone bill cramming, unanimously approved a public comment to the Federal Communications Commission last Friday. That same week, the FCC extended its comment period yet again for proposed rule changes that would crack down on the dubious practice of tacking on expensive charges for services that are almost always never solicited.

In the new public comment, the FTC says it has brought “more than 25 enforcement actions,” as a way to bring such practices to a stop. Those yielded “tens of millions of dollars in consumer redress and refunded charges, and stringent court orders to prevent future cramming violations.”

Just over two months ago, the FTC filed a lawsuit seeking $52 million in damages against Billing Services Group, one of the largest middlemen between crammers and phone companies.

The FTC reports that American consumers have “reported over 1800 complaints of unauthorized charges on wireless bills since 2010.” However, the agency cautions that while landline bill third-party billing is almost entirely fraudulent, there are some legitimate uses of such service on mobile phones—most notably for charitable and political donations.

“However, in light of the significant number of mobile cramming complaints received, and the potential for expansion of the landline cramming problem to wireless bills, the FTC believes that some basic consumer protections are needed in mobile billing,” the FTC wrote.

“At a minimum, all wireless providers should offer their customers the ability to block all third-party charges. Wireless providers should clearly and prominently inform their customers that third-party charges may be placed on the consumers’ accounts and explain how to block such charges at the time accounts are established and when they are renewed.”