Best Methods to Stop Spam Calls?



I recently upgraded to the LG V20 (Sprint), and got a new number as well. A day or so later, I began getting spam calls for some reason. I have never given the new phone number out. 

The spam calls are coming from different numbers, from different states. One from Minnesota, one from Washington, and one from Florida.

Perhaps Sprint is selling phone numbers or apps are forwarding my number to spammers?

My question is; What is the best methods, apps, technologies to stop spam?

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