A:AnswerUnfortunately, the only way to purchase an unlocked iPhone in a new state is by purchasing the device from Apple directly. Best Buy nor any third party retailer has authorization to sell new iPhones in an unlocked state, you will have to purchase the device through a supported network carrier.
A:AnswerYes. You are not required to trade in your old device. However, if both are to function with a cellular connection, you will need two lines on your carrier account (one for each phone). They cannot both be used by the same line.