This happened to me on the way in to work this morning but I was driving through the area (on the highway at least) where the NYC bombing suspect was being chased so I thought they had shut down the cell towers. lol. Signal came back after driving a few miles without doing anything.
FWIW, my iPhone 6S with iOS 9 and even iOS 10 had these random drops with VZW for over a year but wasn't related to an app but just random.
FWIW, my iPhone 6S with iOS 9 and even iOS 10 had these random drops with VZW for over a year but wasn't related to an app but just random.