Question: What is SIM card swap And how would I know if it was done to me on my new iPhone 11 I also have a iPhone X
How would I know if my phone Sim card had been swapped
Swapping SIM cards means pretty much what it says. You take the SIM out of one phone and put it in a different phone. You would know by checking what number is associated with the phone as the SIM card determines what the phone number is.