Empty gray signal bars, can't make calls though 4G works fine.
In the last two days i have been suffering from a very weird problem in my iPhone 6s which i have been using for over 2 years now without any big issue.
The problem is that the operator name is shown, 4G/3G works and i can use the internet, but the signal is empty gray bars, and i can not make/receive calls/messages. and from time to time it suddenly shows no service then tells me something like "if the problem persists, call your operator", though i called them obviously and they showed me that it wasn't their problem, it is kinda logic because otherwise the 4G won't work.
Something tells me that it is a software bug, apple please fix this soon, please!!!
iPhone 6s, iOS 12.1, null