Opting-Out of Junk Mail, Spam, etc

My landlord has been on a crusade today - she's been getting spam mail on her cell phone. And to make matters worse, one of her friends started getting porn offers on her cell phone! Good grief! So my landlord gave me some links to stop receiving all that junk mail. I thought I'd share them with you:

Stop cell-phone telemarketing: http://www.donotcall.gov/

Stop credit-card and bank offers: https://www.optoutprescreen.com/?rf=t

Maybe this will do the trick!