It is probably covered by FCC regulations about 911 calls, specifically, &quot;The FCC&#x27;s basic 911 rules require wireless service providers to transmit all 911 calls to a PSAP, regardless of whether the caller subscribes to the provider&#x27;s service or not.&quot;<p>[1] <a href="https:&#x2F;&#x2F;www.fcc.gov&#x2F;guides&#x2F;wireless-911-services" rel="nofollow">https:&#x2F;&#x2F;www.fcc.gov&#x2F;guides&#x2F;wireless-911-services</a>