Hanghang was talking on the phone after waking up early for dinner . He said the fire felt hot and then lit up in his hand . It left his jawbone exposed and exposed to his hand , leg and arm . Experts cited burns as most likely cause of blast .
Hanghang was playing on the phone after waking up early for school . He said the phone felt hot and then blew up in his hand . It left his jawbone exposed and injuries to his hand , leg and knee . Experts blame battery as most likely cause of blast .