This is a great App! First off, you should take a class in CPR in order to help someone in need. When it happens and someone is on the ground not moving or breathing, it's easy to forget those class room lessons and "What was the number of breaths & compressions?" Now you have a coach on your iPhone to help you keep your head so you can help.
Plus Phone Aid had an update that added more first aid info, a pause button to the rescue slide shows and in every panel you open at the top right is a "911" button to phone for help.
This is a wonderful tool if you live with elderly, have children or if your hurt and others are not sure or trained on what to do. If you can get them to play Phone Aid, this may aid them in aiding you. Something you should teach the children in your home.