The Commission has used FCC Form 477 to collect subscribership information from providers of voice telephone services – incumbent local exchange carriers (ILECs), competitive local exchange carriers (CLECs), and mobile voice providers – since December 1999. The Commission has required interconnected Voice over Internet Protocol (“interconnected VoIP”) service providers to report subscribership information since December 2008. Also, starting with the data reported for 2014, FCC Form 477 has been modified to distinguish “over-the-top” (colloquially, “bring your own broadband”) interconnected VoIP subscriptions from other interconnected VoIP subscriptions.

Comparison to Local Telephone Competition Report

This report was previously titled Local Telephone Competition. Reports under the earlier title summarized FCC Form 477 data through December 31, 2013. Reports under the current title provide much of the summarized data as supplemental spreadsheet files, available at A crosswalk between data elements in this report and data elements in the Local Telephone Competition report is available at that page.