You can't insert modern tech into Bible-speak. God tells us that 'in your head' means your thoughts and 'in your hand' means your actions. It's in many parts of the Bible. This won't go over well here (cause of the anti-Jew stuff) but this is about the strict Bible, no Jewish tradition/etc: the fact is God called HIS mark, the Sabbath (that you are to put it in your head and on your hand) and then in Revelation, the mark of the beast goes into the head and hand too. Sun worshipers met on Sunday and to 'placate' Romans, they mixed that with early christianity to move from Sabbath (Saturday) to Sunday. And if the religious AND secular authority officially mark which days are FOR or NOT FOR work/buying/selling …. doesn't that make it a mark of the beast? Just something to think about for any truly seeking christians.
? What Bible are you reading? Satan is a fallen angel … meaning from heaven. He is NOT of this world.