How 'consent farms' turn one click on a website into an open invitation for spammers to blow up your phone with robocalls

• Spam phone calls have been annoying Americans for decades.
• A regulatory crackdown has had some impact – and forced spammers to get creative.
• Most people are on the Do Not Call list, but "consent farms" claim they sell a way around it.

Been getting slammed with unwanted spam calls? You may have unwittingly asked for them.

Deceptive websites trick you into handing over your number under the pretense of free stuff or job leads. Buried in fine print is consent to let telemarketers contact you — even if you're on the Do Not Call list.