Little bit of horse pucky here. It doesn't suddenly turn your cell phone into a sat phone. No app can make your cell phone suddenly have better signal. Having an actual emergency GPS locator is a much better option. You can always set up your phone without some app to show GPS location to 911. And 911 is who you call in case of emergency, not texting your location to your wife or buddy. With an emergency GPS locator, you take it out, hit a button, and it transmits your location to emergency personnel as well as transmitting a location radio beacon.