The Federal Communications Commission is moving to crack down on illegal robocalls and the use of foreign call centers.

At a meeting Thursday, the three-member commission unanimously approved a new proposed regulation to increase certification and disclosure requirements for obtaining phone numbers, while also expanding those same requirements to all providers seeking phone numbers from the North American Numbering Plan Administrator and resellers.

The rule – which will be shaped through public comments – is meant to make it more difficult for spammers, scammers and other illegal robocallers to obtain legitimate phone numbers. The FCC’s Office of Communications said a majority of the agency’s investigations into illegal robocalling have involved resold numbers...