iFall: An Android fall detection app: Researchers at Florida State University developed an alert system for the Android smartphone platform that both detects falls and alerts authorities. Data from the device’s accelerometer is evaluated using several threshold-based algorithms and positional data to determine a fall, taking into account factors such as height, weight and level of activity of the user. When a fall is detected, a notification is raised requiring the user to respond. If he or she does not respond, the system alerts family or friends via SMS.