This news again sparks the debate whether mobile phones can cause cancer and a recent research seems to suggest that using a mobile phone for just 17 minutes a day seems to up the risk.
Mobile phones have been called as carcinogenic to humans.
A new analysis of the saliva of mobile phone users found that even -eight-hours-a-month-results in higher-oxidative-stress- which is capable of harming a human cell including its DNA. This is a major risk for cancer.
Results pointed out that heavy mobile phone users portrayed markedly higher saliva oxidative stress.
Lead author Dr Yaniv Hamzany said: "This suggests that there is considerable oxidative stress on the tissue and glands which are close to the cell phone when in use. The damage caused by oxidative stress is linked to cellular and genetic mutations which cause the development of tumours."
The study could not provide a conclusive "cause and effect" relationship between mobile phones and cancer, but it does add to the theory that phones could be harmful.
Henry Scowcroft, the science information manager at Cancer Research UK, said: "Brain tumour rates have been more or less unchanged for decades, and this, coupled with the results of large studies, suggests that mobile phones do not increase the risk of developing them."