Can you opt out of location service for 911 calls ? One the one occasion I had to call 911 from my cell phone, I had to laboriously go over my address. There was more friction than ordering pizza since there was a lot of back and forth over the address. So I don't know what this back channel for gps data for 911 does anyway. And ultimately, it seems like a reasonable tradeoff for people to make on their own if they don't want enhanced 911. Cell phone operators will still get other auxiliary and approximate data from towers, but I don't want an API for them to request more precise location.