Major carriers utilize the location engine of the smartphone for cellular and wifi calling when making 911 calls:
https://www.att.com/legal/terms.WiFiCalling.html "911 calls using Wi-Fi Calling will first attempt to route to the appropriate emergency response center using automatic location information from your device. If such information is unavailable, the Emergency Address (No P.O. Boxes) entered in your Wi-Fi Calling settings will be used for routing." We've found Android/iOS locations reported via Wi-Fi discovery to be more accurate than traditional trilateralizaton of cell towers, and often more accurate than GPS-- at least in our urban campus with many reflections and where people spend most time indoors. With Android, we've found new APs are discovered within a day or so (even when the AP is relocated, but is client traffic dependent). We had a vendor survey 10 buildings several years ago for cellular and wi-fi signal strength. The report found when Wi-Fi was included, nearly all floors could place a 911 call (not so with cellular only). Getting that word out has proven difficult. ********** Replies to EDUCAUSE Community Group emails are sent to the entire community list. If you want to reply only to the person who sent the message, copy and paste their email address and forward the email reply. Additional participation and subscription information can be found at https://www.educause.edu/community
