A:AnswerIts unlocked meaning you can and should be able to use it with any carrier across the world as long as you have the right sim for it and the carrier supports or has a sim for it and can activate it.
A:AnswerNo. There are no additional fees. matter of fact there are weekly deals for purchasing via best buy. I have 8 lines and all 8 phones were purchased at Best Buy with a deal of no less than $150 to $ 250 of the original price plus extras. I received a free wireless charger with my S7 Edge. Black Friday offers are the best.