I have heard many people saying there having issues with there 4G devices for different Things. An this is one of things that might be Causing issues with the phones. We all have Static Electricity in our Bodies an one Touch to that Sim could trigger the issue. I had a Rep tell me at one of the local stores We touch them all the time. Well that Dude needs to read up on the consequences of what static electricity can do to Sensitive conductors. That Sim may not be a conductor but the stuff on it can wiped out just like the Info on a Credit Card. So the Input for the Day is if your getting a shiny new 4G phone Make sure the Rep that installs the Sim Card doesn't touch the Gold area an if you are getting it from FedEx read the little Pamphlet that comes with the Sim as it will Tell You Do Not Touch the Gold Area of the Sim Card. B33