Be sure to charge your mobile devices before coming to the United States from other countries. TSA will now be asking U.S.-bound passengers to power up their devices before getting on the plane. If the device does not turn on, the passenger must leave it behind.

Details behind the reason of this increased security measure are vague.

Phones made by Apple and Samsung (that means the iPhone and the Galaxy, two of the most popular phones on the planet) will be singled out, according to Reuters.

France, Germany and the United Kingdom have all agreed to participate in this security measure as of July 6.

Now for some positive news: Air New Zealand is now allowing mobile devices to remain on during the entirety of most flights.