i tried that once with the pager i am required to carry for the company. put it on vibrate and in my pocket. got to where i was going to set up and leaned back in an old cypress tree stump. been there for about 10 min. when i feel a vibration in my hip area. 1st thing comes to mind is snake came out of the stump heart skipped several beats before i realized what it was. had i had a tom in front of me and scared it off because of that pager, it would have gone in the slough!!