I've had really good luck with following the instructions here: https://www.consumer.ftc.gov/articles/0262-stopping-unsolicited-mail-phone-calls-and-email https

I've had really good luck with following the instructions here: https://www.consumer.ftc.gov/articles/0262-stopping-unsolicited-mail-phone-calls-and-email https://www.consumer.ftc.gov/articles/0262-stopping-unsolici... . I've registered for do not call, and opted out for pre-screened offers of credit permanently. I only recently learned about https://dmachoice.thedma.org/register.php https://dmachoice.thedma.org/register.php for physically mailed spam, and I'm getting around to it. I know it's all YMMV, but the number of spam phone calls that I receive has dropped to zero (not exaggerating here). There used to be one annoying travel/timeshare caller, but I reported them to the FTC two or three times, and that took care of it. I personally believe that it's fairly easy because of the time and date information that your phone's dialer/phone app records, but it could be easier with a bespoke FTC "donotcall" app. I'd rather involve the FTC in this sort of thing because it is part of their mandate, and benefits that they bring get propagated to all phone users (Android/iPhone/Windows Phone/feature phones/landlines).