According to the FTC's statement, AT&T was tacking on unauthorized $9.99 monthly charges for things like horoscopes, ringtones, "love tips," and other "fun facts" from third-party companies and then keeping 35 percent of the charges. After the FTC crackdown, AT&T changed its billing practices and had to pay into the FTC fund that is now issuing refunds amounting to, "the most money ever returned to consumers in a mobile cramming case."

As the FTC's new consumer blog notes, customers should be getting back about $31 each on average. Around 2.5 million customers will see their refunds show up on their AT&T mobile bill in the next 75 days and another 300,000 former customers will get their refund via a check in the mail.