PopSci - the largest completed analysis to date of brain tumor (glioma and meningioma) risk in relation to mobile phone use concludes: "Overall, no increase in risk of either glioma or meningioma was observed in association with use of mobile phones. (Filed under "I told you so.." :-)
This result is in line with the majority of other published studies, which also observed no increased risk of brain tumors in association with cell phone radiation and cite biases and errors in those studies that do show a correlation. But the publication of the Interphone results does not address the two main concerns of those who believe cell phone radiation may have an impact on human health: namely, that the effect of long-term exposure, especially on children, is still unknown and that brain tumor rates alone are not the proper metric by which to measure risk... please read more at PopSci