Hi all. I have a somewhat perplexing question. I have the opportunity to purchase a Verizon iPhone 6 (the standard 16GB gold model) from a friend. The phone is for Verizon in the United States, and I'm an AT&T customer (with no plans to change that anytime soon). My friend doesn't have the phone yet, but should be getting it fairly soon. My understanding is that he is using an upgrade to purchase the phone. So my question is as follows - if I purchase the phone from him, will I be able to put my AT&T SIM card into the Verizon iPhone 6 and use it and all the features? Thanks for any replies and assistance. I appreciate it a lot.