Does Cell Phone radiation cause brain cancer?

Unlikely. In theory non-ionizing radation is not energetic enough to change the structure of molecules unless it is powerful enough to cause heating (like a microwave oven works). Cell phone transmitters are low power and to extend battery life further reduce their power to the minimum necessary to communicate to the nearest cell tower. The frequencies that cell phones operate on also are less efficient at heating tissue than those used in a microwave oven.

Studies that compare the cancer rates of heavy cell phone users with others have been inconsistent; some indicate a relationship while others don’t. Even in studies that show a correlation there is nothing to show a causal relationship between cell phone use and any form of cancer. For example people who use a cell phone > 4 hours/day may get more cancer than other people because they have more demanding jobs, are under more stress, or because eating on the run causes them to have a worse diet.

There are still studies going on to determine if low-power non-ionizing radiation can cause health problems but for the time being there is no good reason to believe that cell phone use is injurious.