Robocalls to my kid RW phone

My middle school age kid has what we suspect was an old business number. She get a ton of robocalls during the day offering marketing services for the business. Is there any way to block the numbers?? It seems this is an old topic and service providers do not give the option. Is that the case with RW? If so, any other options? Thank you in a advance.

how-to-find-out-your-phones-sprint-number-_Dealing_With_Unwanted_Calls

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