I use Truecaller[1], so far it has worked great. They crowdsource their blocklist so almost all telemarketers are marked as SPAM on their first call. You can th

I use Truecaller[1], so far it has worked great. They crowdsource their blocklist so almost all telemarketers are marked as SPAM on their first call. You can then choose to proceed and take the call or add it to your blocklist. [1]https://www.truecaller.com/ https://www.truecaller.com/