This week's issue of Entertainment Weekly sports a live-tweeting interactive video display. The folks from Mashable did a teardown to see how this was accomplished, and discovered that there is a complete (albeit without a case or keypad) Foxconn Android phone glued between the pages, along with a T-Mobile SIM. By poking around, they were even able to make phonecalls with it.
They didn't show what happened if you put the SIM in another phone, which would be a neat trick, and I also wondered about the injunction to turn off mobile devices for takeoff and landing.
We Found a Free Smartphone Embedded Inside Entertainment Weekly (Thanks, Fipi Lele!)