CHARLOTTE, N.C. — North Carolina Attorney General Jeff Jackson has launched a nationwide effort to stop illegal robocalls , sending warning letters to 37 phone companies that aren't following federal rules.

The action is part of Operation Robocall Roundup, led by a task force of 51 attorneys general from across the country. Jackson said the companies have three weeks to start following the rules or face further action.

"North Carolinians are getting bombarded with millions of invasive robocalls every day, and these communication companies are not following the rules to protect us," Jackson said. "We are giving these companies three weeks to start following the rules so we can shield people from these annoying and illegal robocalls."

The 37 companies receiving warning letters haven't fol

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