Hello, I am traveling. I have the sim card installed on my iPhone 6s Plus. Once I moved to another country, the name of a local phone company shows up on the top left hand corner. I guess the phone is using my sim card and local company. Am I right? Since I don't plan to make or receive phone call, I want to turn off the use of sim card. Is there a way to do it without removing it physically? I went to settings, carrier. Even I turned off automatic, some searching was going on. Then, a list of local companies from the country where I travel shows up. When I moved back to setting, the name of one of the companies showed up. Then, I pressed carrier again and iPhone automatically turned it on! How can I stop the phone from using the sim card without me removing it?