If you're in a crash where airbags deploy or, in certain vehicles, the fuel-pump shuts off, 911 Assist® with GPS uses your paired phone to call a 911 operator. The microphone is on so anyone in the vehicle can speak to the operator. 911 Assist is off by default, so you must change settings to turn it on. Most SYNC® vehicles can be upgraded to include 911 Assist.27,28