Note: Some Android phones, when they sleep (hibernate), turn off the phone's sensors. CRADAR uses the phone's accelerometer to sense a fall. If the accelerometer is off, CRADAR will not work. To remedy this we have programmed a warning message to pop up on phone's that have this issue. On those phones, CRADAR will dim the screen but will prevent the phone from going into full sleep mode, in order to keep the accelerometer active. Please Note: I have been reading in the bike forums from several people who say the sensitivity settings don't work for their phone. Please trythe custom setting. This will properly set the accelerometer's sensitivity for most phones. Following is a list of phones which we have been told don't accept a custom sensitivity setting: Samsung Infuse SGH-I997 (thanks Ragtop69gs) There have also been questions about the GPS killing the battery. CRADAR does not use the GPS until it detects a fall, so it shouldn't kill your battery. If CRADAR creates a battery issue with your phone, please let us know what phone you are using. If we can't find a work around, we will post the issue so other owners of the same phone know about it. The story below is mine. This app is important to me and I intend to keep CRADAR free and accessible for everyone. Jay