The speculation about the connection between phone use and brain tumors has started a huge global debate on the issue Monday.

A 10-year Interphone study has been carried out in 13 countries, in which more than 12,800 people were included, out of which 5,150 brain were cancer patients and about 2,708 were afflicted with glioma brain tumors and 2,409 had meningioma brain tumors.

International Agency for Research on Cancer conducted the research which was partly funded by the cell phone industry. The participants were put in the top 10 percent of phone users, if they used mobile for 30 minutes of talk in a day.

According to the Sunday Times, “Some of the questions raised by the Interphone research are puzzling. The statistics appear to show that at lower levels of usage, mobile phones actually protect against cancer, something that even the study’s authors reject as implausible”.

The Interphone study failed to find increased risk of glioma or meningioma tumors after 10 years of using a mobile phone. Though, heaviest users should take care of it.

Study's chief author, Elisabeth Cardis shared that though the study failed to reveal an increased risk, but it does not suggest that there is no risk at all. The heaviest users had a 40 percent higher risk for gliomas and 15 percent for meningiomas.