There is no conspiracy here people. The US government arent covering anything up. A lot of the research into this has been done in other countries, where the US government has no jurisdiction, and diminishing influence. If anyone had discovered a genuine statistical link(and statistics are very complicated and prone to misinterpretation) between mobile phone usage and any sort of cancer that could stand up to peer review, it would have been published, somewhere. No peer reviewed study, in any country, has ever found a convincing statistical link between mobile phone usage and cancer, ever.
This is not to say that there is not a risk, but if there is, it is so small that it is indistinguishable from statistical noise.