In the message, she asked her son to bring her coat when he came to meet her at Beijing airport on March 8, 2014.
It's been more than 500 days since the flight veered off course and disappeared without trace en route from Kuala Lumpur, Malaysia.
After 500 days of mystery, MH370 answers could come soon
The last time Wang listened to the message was last week, when news emerged that beach cleaners had found a barnacle-encrusted piece of plane debris on the French island of Reunion in the western Indian Ocean.
The object - now confirmed to be part the wing of a Boeing 777, the same model of plane as Flight 370 - has raised hopes that it could peel back some of the layers of mystery that shroud the fate of the Malaysian plane and the 239 people aboard.
