if i buy an unlocked iphone will apple relock the phone if i do a firmware upgrade or connect it to my computer

dont update past 1.0.2, you can download older updates on apple hacking sites.. if you download the new firwares your phone will become a lovely brick

Is an unlocked iphone currently legal?
I heard that Best Buy will soon be selling unlocked phones
if you can legally buy an unlocked iphone then nobody, not apple not at&t not even Charlie's Cheap Cellular ( made up company name ) can re-lock you phone.