Hi, I was just wondering that, if I buy an iPhone 4S from an Apple Store (in Canada), and not online, will it still work everywhere in the world? Also, will the price in the physical Apple Store be exactly the same as the price online on the Apple Canada website? Also, does anyone know if it will work for sure in Saudi Arabia? Since it's "factory unlocked", it should work, but I just want to make sure 
Thanks!

Thanks!