Im sorry for the redundancy of this post, I would just like some reassurance that my understanding of all of this is correct. My first assumptions/understanding: 1. The Verizon/Qualcomm iphone X is universal, and the best buy version will come unlocked with no sim if you paid cash. 2. If you put a Verizon Sim in the phone first, it will stay forever unlocked 3. If you put at At&T sim first, it will lock to AT&T. I have access to a Verizon sim, although my personal plan is through AT&T. Theoretically I would like to have a forever unlocked phone, but want to confirm the process. 1. Put in Verizon sim, turn on phone. What happens then in terms of activation? Will this do anything to the friends phone/account of the sim I borrowed? 2. Once turned on with verizon, turn off and put AT&T sim from my current iphone 6 in. Setup as normal? Is there any chance that putting the Verizon sim of my friends phone in first would screw something up?