I have an iPhone question that is probably a simple one---but I don't want to have to register in the iPhone forum just to get one question abswered. I have an iPhone 4S running iOS 9.2.1. In a discussion with my wife about our level of service I tried to check it via the carrier status icon on the status bar and it wasn't there! Did these things just vanish as I nodded off during an OS upgrade? How can I get it back or otherwise check our service level? And what has made it vanish?