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This is empirically false as I've been registered for 19 years and still receive several a day.

it works for me as I stated and there are 1,000’s of companies that have my cell, I’ve had the same number for two decades

People told me this about the DMAchoice website the FTC links to.

$6 later, and I receive exactly the same amount of junk mail as before.

The one that stops credit card offers, though, definitely worked for me. It's been a long while but I think it was the Opt Out PreScreen site.

I registered 3yrs ago and it hasn’t helped. They just get phone numbers off of job boards because you might answer if you are looking for a job

About as effective as robots.txt.