So I've seen discussion of this elsewhere, but only as it relates to the iPhone X. I still have an 6S. I used to get 1-2 bars at work - not great, but enough for calls/texts to come in - to "no service" all day every day. Same desk, same office, same phone. AT&T isn't great where I live but like... come on!! I was thinking of a phone upgrade, but it sounds like the X has this issue too? I wonder if it's just the X or something with iOS 11, though? Am I the only person who's experienced this? I can't find anything online from folks who only updated OS, not phone.