Federal regulators permanently block the company from U.S. networks after a pattern of non-compliance with anti-robocall rules
The Federal Communications Commission has taken decisive action against a voice service provider it says repeatedly violated federal robocall regulations, ordering the company blocked from connecting to U.S. telecommunications networks.
The FCC mandated that all U.S. voice service providers and intermediate providers block calls originating from SK Teleco LLC, a decision that also results in the company’s removal from the agency’s Robocall Mitigation Database. Providers directly downstream of SK Teleco have up to 30 days to begin blocking the company’s calls, though the FCC permits providers to initiate blocking within 48 hours if they choose to act more quickly.
The Robocall Mitigation Database was established by the FCC to promote transparency among telecommunications providers and to ensure that companies operating on U.S. networks are actively working to reduce illegal robocall traffic. As a condition of being listed in the database, providers must certify that they have implemented STIR/SHAKEN caller ID authentication across all internet protocol-based portions of their networks and must submit formal robocall mitigation plans. Removal from the database carries significant consequences, as providers not listed may have their traffic blocked by others in the telecommunications chain.
The case against SK Teleco traces back to 2025, when the Industry Traceback Group, an organization that investigates suspicious call traffic on behalf of the telecommunications industry, conducted tracebacks on a series of calls impersonating Walmart. Those investigations, launched in response to consumer complaints, determined that SK Teleco was the provider that originated the calls. The Industry Traceback Group notified SK Teleco of its findings and gave the company access to data identifying each call in question.
SK Teleco did not dispute that it had originated the calls, but it also did not provide evidence that it had obtained the legally required consent from call recipients. More significantly, despite having certified in its database filing that it would respond to all traceback requests within 24 hours and cooperate with investigators, SK Teleco failed to respond to any of the traceback requests submitted by the Industry Traceback Group in connection with those calls.
The FCC’s Enforcement Bureau issued a Notification of Suspected Illegal Traffic in December 2025, followed by an Initial Determination Order and Order to Show Cause in April 2026. SK Teleco did not provide a sufficient response to the initial notification and filed no response at all to the subsequent order. That failure led directly to the final action announced this week.
As a result of the enforcement action, SK Teleco will not be permitted to refile a certification with the Robocall Mitigation Database without obtaining prior approval from both the FCC’s Enforcement Bureau and its Wireline Competition Bureau, a condition that effectively raises the bar substantially for the company to resume operating on U.S. networks.
Patrick Webre, Chief of the FCC’s Enforcement Bureau, said the action reflects the agency’s broader effort to hold telecommunications providers accountable for the traffic they carry and to work cooperatively across the industry to combat illegal robocalls.
Robocall fraud remains a significant consumer protection concern in the United States. Impersonation scams, including those mimicking well-known retailers and government agencies, have been among the most commonly reported schemes in recent years. The FCC has increasingly used its authority over the Robocall Mitigation Database and its enforcement powers to target providers that originate or facilitate such calls rather than focusing solely on the callers themselves.
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