A:AnswerTo purchase an unlocked iPhone in new condition, you must purchase the device from Apple directly. Best Buy no longer sells iPhones in an unlocked state. To purchase an iPhone through Best Buy or any third party retailer, you must purchase it through a supported carrier.
A:AnswerNo, you can upgrade it anywhere as long as it has T-Mobile carrier even if you go to T-Mobile they have different deals and if you go to Best Buy they have different deals but they do have T-Mobile carrier. That’s how I got my deal from Best Buy but T-Mobile carrier.