I have an iPhone 7 that I was using on Virgin Mobile. This account has now been moved to Boost Mobile as Virgin was sold to Boost. I just purchased a brand new iPhone 11 Pro and tried to swap this phone for the old iPhone 7, however, I am getting a message that it is not compatible and unable to be registered with Boost. I see that you are selling iPhone 11 Pro phones on your site. Why am I unable to register this device and swap my old phone for the new iPhone 11 Pro?