I'm using an iPhone 5. Today, after updating it to the latest iOS 9.3 the following problem occurred:
My iPhone 5 is "Never locked" one, the sim card is also working properly - checked on my other cell phone.
This sim card is from a Bulgarian operator (who sells iPhones), and now I'm using their roaming service while in Berlin, Germany.
When I insert my German sim card, the iPhone is working.
This problem is so stupid and annoying!
Please guys, give me an advice what should I do.