[username190]

In addition to what was noted by a sibling comment (emergency calls are given higher priority than your standard commercial voice or data traffic), there is specifically an exemption listed in California's Net Neutrality law [0] for emergency traffic.

> 3103. (a) Nothing in this title supersedes any obligation or authorization a fixed or mobile Internet service provider may have to address the needs of emergency communications or law enforcement, public safety, or national security authorities, consistent with or as permitted by applicable law, or limits the provider’s ability to do so.

[0] https://leginfo.legislature.ca.gov/faces/billNavClient.xhtml...