"Look to the consensus in the scientific community. Look to trusted sources like the FDA," said Joe Ferran, spokesman for the CTIA. "When you listen to those folks and see what's been published, it is clear there is no link."
The FDA says it has no reason to believe that cell phones pose a real risk to safety.
"If there is a risk from these products -- and at this point we do not know that there is -- it is probably very small," the Food and Drug Administration says on its Web site.
In 2006, the Journal of the National Cancer Institute published the largest study to date on the correlation between cancer and phone usage. The study, which followed 420,000 Danish users, many of whom had used phones for more than a decade, found no risk of cancer among them.
Analysts told ABC News.com that the memo would make little impact on the market.
"[Herberman's] theory would have to be seriously corroborated before people began to abandon a technology they are so closely wedded to," said Robert Enderle, a technology analyst and president of the Enderle Group.
"Even if a conclusive link was discovered, I doubt it would make much difference," he said. "People know cigarettes are bad, but they continue to smoke. There are laws requiring people to use headsets while driving because of the danger, but you see people talking on their phones when they're driving all the time."
The Associated Press contributed to this report.