Almost all the new phones have the capability to send 911 your location. However, most call centers haven't been upgraded to receive and process location information.Yes, i read about it. It raises questions. So why is there "SOS" function in iPhones? Kind of odd that LE can't triangulate the position of the cell phone in Herndon, sorry.
There've been a variety of bills before Congress to build a next-generation 911 system (which could also handle texts and forward messages to the correct call center) but as far as I know there's been no movement on them.
House introduces $15B next-generation 911 funding bill | StateScoop
Lawmakers introduced legislation that would provide a standalone funding mechanism for the nation's upgrade to next-generation 911.
statescoop.com