Rescue Alert has created a mobile medical alert system to work with Android phones. The app connect the user to the closest 911 center. Like other medical alert devices, the subscriber simply presses a button and is directly connected with a Certified EMD response center attendant The silent alert requires only minimal typing to explain why 911 services are needed. The 911tm dispatchers know the location of the user, so the alert works outside the home. The RA-911 medical alert costs $10 a month. You'll find more information
here.