The FCC announced late last week that it would investigate Verizon, AT&T, CenturyLink and Frontier over highly strict service terms in wireline business service contracts, which critics say lock customers into their deals unfairly.

The commission is particularly focused on the special access market, which encompasses the legacy copper links that make up part of the fabric of U.S. Internet service. The large incumbent providers under investigation control a lot of these special access links, and their competitors have been claiming for years that they’ve leveraged these localized monopolies to keep customers from jumping ship.

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