I don't know about them cloning a phone or sim but it did happen to my mother and I. Family plan...mom, sis, bil, myself all on a family plan. Suddenly we get a bill for about 4K. Dad calls me wanting to know just what I have been doing...then looks closer into the bill. Mom and my phones were cloned and placing calls around the clock from Florida to Cuba. Every few minutes a call was going out. Sounds like someone was selling phone calls to the locals there on our dime. Phone company ended up dropping the charges as it was obviously not us.