Here is some information posted to the FCC Official Website:
Many consumers find unwanted texts and email – which can include commercial messages known as spam – annoying and time-consuming. And unwanted texts to mobile phones and other mobile devices can be intrusive and costly. Two laws – the Telephone Consumer Protection Act (TCPA) and the Controlling the Assault of Non-Solicited Pornography and Marketing (CAN-SPAM) Act – address spam.
Unwanted Texts and the Telephone Consumer Protection Act
The TCPA and the FCC’s rules ban many text messages sent to a mobile phone using an autodialer. These texts are banned unless (1) you previously gave consent to receive the message or (2) the message is sent for emergency purposes. This ban applies even if you have not placed your mobile phone number on the national Do-Not-Call list of numbers telemarketers must not call.
For more information on the TCPA and the national Do-Not-Call list, see our consumer guide.