"ICE-Lock" helps you to create a Wallpaper for your Lock Screen with 1 or 2 ICE telephone numbers.
In Case of Emergency (ICE) enables first responders, such as paramedics, firefighters, and police officers, as well as hospital personnel, to contact the family of the owner of a mobile phone to obtain important medical or support information.
In iOS7 your phone is locked with a Passcode, which means that there is no way for the first responder to access your phonebook to find the ICE numbers you have added.
If you create a Wallpaper with "ICE-Lock" the first responder just needs to view the Lock Screen to find your ICE numbers.