Hello I am from India. I was wondering if I can buy the iphone 3gs from best buy from somewhere in the US, unlock it and then use it here in India or in the UK? Do I need to sign/purchase a contract with AT&T or any other specific carrier when I purchase the iphone 3gs from best buy? Also if you have any other alternative to purchasing the iphone and then using it in India and the UK please tell me! Thank you so much in advance.