Front Door Software ($2.99)

Multi-patented in-front and/or behind lock screen messaging and alert capabilities to enhance your personal safety. 2-touch automated message sends your pre-loaded set of emergency contacts a geo-location map pin tracking your current location.
Also helps recover your mobile device if it is lost or stolen.
The following features are supported by this version:
* Display ownership recovery information before or with the lock screen to help recovery.
* Control and update your ownership info displayed from remote - perfect for traveling.
* Track your device online if it goes missing -- helps increase chances of recovery.
* Access to emergency buttons at or with the lock screen saving valuable seconds in an emergency.
* M button default will send a text to up to 4 people with custom message and location in a medical emergency.
* E button default will send a silent text to up to 4 people with custom message and location in an emergency.
* A button default helps you text up to 4 people with a quick tap to let them know you arrived at a location.
For any support questions, please visit: http://www.frontdoorsoftware.com/contact-support/