Most of the robocalls you get aren't coming from AT&T, Sprint and T-Mobile numbers [telecom]

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A new report suggests that the United States' top mobile carriers are making headway in the fight against annoying robocalls.

The data analytics company Transaction Network Services (TNS) released its bi-annual "Robocall Report" on Thursday, and some of the emerging unwanted call trends included an increase in hijacking mobile numbers and a shift to spoofing toll-free numbers.