That idea is a lot more practical. It'd be tough to find your phone and pound the power button in a bad situation. A program/service that triggers on a lack of

That idea is a lot more practical. It'd be tough to find your phone and pound the power button in a bad situation. A program/service that triggers on a lack of input is a lot more likely to actually WORK when it's needed. As another poster pointed out, this already exists for iOS: https://itunes.apple.com/us/app/safetrek/id716262008?mt=8 https://itunes.apple.com/us/app/safetrek/id716262008?mt=8