[QUOTE=Kookork;1501889] His advice is still sound, even if the attitude he wrote it in is not appreciated. If your survival depends upon your cell phone being operational in a time of emergency then why not bring a spare battery or turn the phone off for the entire length of the trail to preserve the one battery you are carrying? If my life depended on my cell phone being available in a time of emergency, you can bet I won't be wasting battery power by turning it on until the point that I needed it. Heck, when I hike I take spare batteries for the things that are not life savers, like my camera and kindle, so you can bet that I'm going to have an energy plan for my phone (or satelite phone).