This free app could save your life!!!
This app, Advanced 911, lets you text 911, send photos, plus it automatically sends your location (address, lat and long, and Google maps link - Nice).
This is important since the pre-installed iPhone SMS/Texting app, Messages, doesn't support texting to 9-1-1. 911 texts go nowhere! In fact, Advanced 911 is the only app available to do this!
If a 9-1-1 center isn't available, it helps me send a message to a friend with my location asking them to get me help. The app provides a button on the app's home screen to call 9-1-1.
It can be downloaded free from iTunes by searching for Advanced 911.