I have an I Phone Xs Max and will soon be traveling to Israel for almost 2 months. How do I know where my SIM card slot is and whether or not my phone is locked? I have found in previous visits that the best way to get the calling, texting and data that I need is by purchasing a SIM card from 019 Mobile and swapping it with my United States one. The problem is that this particular phone has never been overseas and , at the time of my last trip, I had a different carrier. HELP!