47 C.F.R. § 10.280

(a) CMS providers may provide their subscribers with the option to opt out of the “Child Abduction Emergency/AMBER Alert,” “Imminent Threat Alert” and “Public Safety Message” classes of Alert Messages.

(b) CMS providers shall provide their subscribers with a clear indication of what each option means, and provide examples of the types of messages the customer may not receive as a result of opting out.