In US, a hiker and his son got lost on a camping trip in the mountain in late March although the trail leading to the top is marked by small piles of stones. The man phoned 911 at midnight.

The morning after, two rangers came to get them back to the trail.

According to the president of the American Hiking Society, hikers calling for help on mobile phones “is definitely an increasing problem. People assume, if they take their cell phone, then that is their safety measure. But there are other things they need to have. A cell phone should be a last resort, and depending on whether you can even get cell phone service on a trail, it might not be any kind of resort at all.”

More in USA Today.