A:AnswerTo be sure your question is answered, you'd really have to contact Best Buy. IMHO you'd have to buy from Apple if you want any hope of international warranty as Apple is many countries. I think Best Buy is USA-based? (far as I can tell). Apple advertises a lower price than Best Buy IF you have a good trade-in. Good luck.
A:AnswerI purchased it using my BestBuy Credit card. They gave me two options. First was to pay for it out right and then I would get points that convert to $$$ that I could use for a future BestBuy purchase. If not I would have chosen to finance it for 18 months without interest if paid in full but there could be newer options... I would ask an employee.
A:Answerif the phone is paid off you can usually ask your service provider to unlock it for free for you. if not, then to have an outside service to it, yes they will charge you. I do not believe that you have to be in the USA to get it unlocked.