Try FallSafety for free on your Android phone to see if it is compatible.
FallSafety is compatible with many Android phones shipped since October 2015 and are running Android versions 6 or newer. Many Motorola phones shipped prior to October 2015 are also compatible.
FallSafety requires iOS version 8 or newer. Since iPhone 4 does not support iOS 8, iPhone 4 is not supported.