In a recent statement, FCC Chairman Ajit Pai announced an investigation was underway to determine whether a particular mobile carrier had lied about the extent of its 4G coverage. But we’ll have to wait to find out the name of the culprit.

Pai said the investigation was prompted by a review of more than 20 million speed tests filed with the FCC in connection to the Mobility Fund Phase II Auction (MF-II), which is designed to subsidize rural areas lacking 4G access to the tune of $4.5 billion over the next decade.

Part of the process involves mobile carriers submitting maps and data to outline the extent of current 4G LTE coverage.