I purchased an iPhone 11 Pro Max and ordered it unlocked. When the phone was set up, it had to be taken to the T-Mobile store for connection. I was then advised that the phone was locked and that it could not be activated. I then called Back Market and they basically washed their hands and stated that I had to take it up with the third party seller. At this point, my credit card was charged and I have no product. Not only would they not give me a contact number to the third party company, but they refused to put a supervisor on the phone to help address the situation. So buyer beware. You get what you pay for, or not.
It will not take long before the word gets out of the poor customer support.