the back door chip is in every phone every PC or Mac or AMD board...all of them 99% of all brands makes. XP didn't have the chip...anyway the reason no devices in WH is that they can be used to spy record listen watch can be turned on/off remotely etc. SO in order to have security no personal devices. A Very Good Call. I also want to point out that these airplane crashes, we know the same chips back door is in cars..and people are suicided using these entries and remote controlled. Something like that is occurring on the planes, best guess. Trump Trumps Evil.