The incident raised fresh trouble for Samsung, which saw its new Galaxy Note 7 device recalled last month because of overheating batteries.
Samsung, Southwest and federal aviation-safety officials declined to say what model of Samsung phone was involved, saying they were still investigating.
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Green told the newspaper that her husband, Brian, received the Galaxy Note 7 about two weeks ago as a replacement for his recalled phone. He called her from someone else’s phone to tell her what happened.
Last month Samsung agreed to recall the Galaxy Note 7 after receiving 92 reports of batteries overheating in the US, including 26 reports of burns and 55 cases of property damage.
The Federal Aviation Administration took the unusual step of warning passengers not to use or charge the devices while on board and not to stow them in checked luggage.
Flight attendants on many airlines added a warning about the Samsung device to their pre-flight safety demonstrations.
However, the FAA’s advisory to airlines did not apply to replacement Galaxy Note 7s. Those phones have a green battery icon.
Samsung Electronics said in a statement that it could not confirm that the latest incident involved a new Note 7.
Samsung said it is working with authorities to recover the device and confirm the cause of overheating.
The FAA also declined to specify the model of the phone.
Spokesman Ian Gregor said the FAA was still investigating the incident.
The Galaxy Note 7, which sells for $850 to $890, competes in the high-end smartphone business with Apple and its new iPhone 7.
Samsung dominates the market for Android-powered phones but faces growing pressure just Tuesday, Google unveiled its new Pixel phones at $650 and up.
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