Here's the scenario: We have been skiing Deer Valley all morning, mostly in the woods, before our lunch break. My daughter (24 yo, 'nuf said) had been taking pictures all morning with her relatively new (5 mos old) iPhone 10. I told her to "Stow it before you lose it". Her response was: "Yeah, Dad, blah, blah, blah..." At lunch, my daughter asked us if we had her iPhone?! Are you kidding me?! It was gone! The look on her face said it all (she is paying the phone off in installments which explains the look)! I calmly said this is when we find out if Find my iPhone really works or not. The critical factor was battery life, as it was about 25F out and it was over an hour since the phone was dropped. Compounding the problem was that snow had been falling all morning meaning the phone was definitely buried somewhere. She had a rough idea which trail we were near when she last used the phone. Unfortunately, we were skiing in the woods between trails when she used it last. Not looking good. So off we went, following the little map on our iPhones. We had to take multiple lifts to get near the signal. Amazingly, we passed it on the last lift up. We finally went "off piste" in search of her phone. As we slowly and carefully descended the wooded, off trail section, the map on one of our phones indicated we had just passed her phone. So we activated the pinger, and amazingly, my wife (who was about 20 feet above us) could hear it. She homed in on the sound, saw a shadow and dug about 3 inches under fresh snow to pull the iPhone out. Nothing short of amazing! This technology really works. Hats off to Apple!