Teh Grauniad wrote:Passengers flying to US may have to switch on mobile phones for security
Some direct flights to US will require passengers to show cellphones, as authorities work to counter threat of explosives
“During the security examination, officers may also ask that owners power up some devices, including cell phones,” the US Transportation Security Administration (TSA) said in a post on its website. It warned: “Powerless devices will not be permitted onboard the aircraft. The traveller may also undergo additional screening.”
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