My iPhone 6 is really weird. It will loose cellular network at night time and it will just say "No Network" or constantly say "Searching.." No on/off, flight mode on/off, hard reset, network setting reset, setting reset or content and setting reset will work. Even setting up as a new iPhone will not prevent it. Now the weird part is, that if I disconnect the battery and connect it again, then it works!!! All day only to loose cellular network next day towards night time. Then I reconnect the battery again and I can go another day. I am on my 4th day now. So everything works, just not as it supposed to. Really annoying to have to open the phone everyday. Does anyone have an idea of what is going on? :-( Thank you.