The researchers said the findings were significant enough that they felt the urgency to release the results before the entire study was complete.
More than half of the 74-page document was scientific reviewers responses to the findings.
In a statement, the CTIA said numerous international and U.S. organizations have determined that the already existing body of peer-reviewed and published studies shows that there are no established health effects from radio frequency signals used in cellphones.
Given the lack of evidence for an increased incidence of brain tumors in the population in recent decades, I do not expect health agencies to react very strongly to these findings, said Kenneth Foster, a professor of bioengineering at the University of Pennsylvania.
Devra Davis, founder of advocacy group Environmental Health Trust, disagreed.
The results suggest that there may be no safe level of exposure to cell phone or wireless radiation, said Joel Moskowitz, director of the Center for Family and Community Health at the University of California at Berkeley who has been an outspoken proponent of the idea that cellphones cause health effects.