In light of the IARC decision, the World Health Organization and national health agencies, such as the U.S. Centers for Disease Control and Prevention, might decide to provide similar guidance on cellphone use.
"[The] IARC is saying that we should be cautious and think through what we do when we regulate exposures from cellphones," Georgetown's Shields said. "They follow the precautionary principle and want to maximally protect public health."
The Federal Communications Commission (FCC) requires cell phones to meet safety standards based on the advice of federal health and safety agencies, an agency spokesman said in a statement.
"We support the IARC recommendation for more research to clearly identify any potential health risks and, as appropriate, consider whether further actions may be required."
The Associated Press contributed to this report.