The study also said that the rate at which glioma develops depends on the number of hours of use of these mobile phones.
Researchers from University Hospital in Orebro, Sweden matched 1,380 patients with malignant brain tumors to people without such tumors and compared their wireless phone use.
In the study, those who recalled talking the most more than 1,486 hours on wireless phones were twice as likely to develop glioma compared to those who said they used the devices the fewest hours between one and 122 hours.
According to the study, slightly more than five out of 100,000 got diagnosed with a malignant brain tumor between 1995 and 2002. It also did not show any link of wireless phones with other malignant brain tumors other than glioma .
A World Health Organization panel classified mobile phones as "possibly carcinogenic" in 2011.