You don't have time to find out what you want to know?
Goldman Sachs was mistaken. You would have found that out, by taking just 3 minutes in this thread. The iPhones bought through the installments are and have always been unlocked.
You are the one needing to buy the iPhone. not us. If you can't be bothered to read, then you are going to be assuming things that are not correct as is the case here throwing blame and buying some other device.
Clearly if this is important to you, you would make the time to do the legwork. We can't do the work for you, and its not going to just pop up in front of you as if by magic.
If you don't want to read and find out what you can and cannot do, then that's entirely up to you.
I have posted the reply multiple times in this very thread. What you want is for me to post it again just for you? Why do you believe you are entitled to that? You cannot be bothered to read a couple pages, not even the entire thread but expect me, to just post what has been said dozens times already?
I volunteer here. I don't get paid. If you can't take 5 minutes to find the answer, then I have no real incentive to want to help you.