Britain's National Radiological Protection Board is advising children to spend as little amount of time on mobile phones as they can.
Although the group acknowledges there is no conclusive evidence of cell phones having harmful health effects, they say there is a possibility and kids should take caution.
They say children are more susceptible to the effects such as non-malignant brain tumors, because their nervous systems are still developing. They believe this makes their tissues absorb more energy. They also say young people will have more long-term exposure.
But the only hard evidence on these harmful effects is contradicted by studies that say there are no harmful effects.
Experts at Michigan State University say proving any radio-frequency energy even from fluorescent lights, is a much-heated debate that has yet to be proven either way.