Just shake your phone hardly on your emergency.
Call of Victim is the most efficient app for asking help from your friends or family members on your any kind of emergency. If you are staying far from them then there is also option to send instant alert to the app users who are staying around 5 km from your current location.
After sending an alert by you the app will keep sending alert for while to your friends with your live location details. The cost of sending alert is totally free. After getting your alert they can trace you by google map/satellite/street view.
You can also post on your facebook wall via the app with your current google map location url & then your facebook friends can trace you with your exact location. If you are not connected with internet then you can send SMS and make a phone call to your previously saved emergency number. You don't have to write anything by yourself just shake you phone on your emergency.