AT&T is rolling out its first of a kind free robocall blocking service for its customers.

But according to CBS News, it might not be totally free.

The free service would block calls it suspects are fraudulent like IRS claims demanding money. It would also flag other telemarketers so users can swipe them to voicemail or block the call.

The service with all the works that would automatically send all suspected robocalls to voicemail costs customers $4 a month, according to CBS News.

Millions of AT&T customers will start getting the free service over the next few months, AT&T said.

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