Imagine being caught in an emergency and you need to call 911 or one of your emergency contacts. Do you want to have to go to your phone book? Do you want to have to dial the numbers?
With 911 you can call the 911 operator with two simple clicks.
In addition the 911 application allows you to set up two additional emergency contacts from your phone book and becomes a rapid dialer in an emergency.
Put this app on the bottom of your iPhone navigation to have it always there in an emergency.