The US authorities have warned airline passangers not to switch on or charge their Samsung Galaxy Note 7 phones when on board the plane. The Federal Aviation Administration, FAA also advised against packing the phones into any checked-in luggage. Samsung recalled the phone last week after reports emerged of the device exploding during or after charging. Qantas and Virgin Australia have also told customers not to charge or use the phone during flights. Samsung said it would speed up shipments of replacement Galaxy Note 7 phones to ease safety concerns. Samsung has said that battery problems are behind the phones catching fire, but that it is difficult to work out which phones were affected among those sold.The phone was launched last month and has been otherwise generally well-received by consumers and critics. Some 2.5 million Note 7s have been shipped globally. Samsung has said customers who have already bought the phone will be able to swap it for a new one and that it would take about two weeks to prepare replacement devices.