Recommended spam/robo blocker for old phone

I have a Moto X first gen and it does not have the features to block a spam call. The latest ones were from Colorado, Texas and New York about my SS being suspended.
Does anyone know of a simple free app that works well for this?

There’s some advice here: How to block unwanted calls and texts

Thank you Louisdi, I read the article but my phone is old and does not have that feature.

I think you read another article. This article specifically addresses the phone you have here: How to block unwanted calls and texts

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