WASHINGTON - Some four billion people worldwide subscribe to wireless services -- but new research suggests this technology could lead to significant health problems.

Senate hearings looking into the dangers of cell phone use began Monday. While experts note that all cell phones emit radiation, a new study suggests using any of them can be dangerous.

Many people use their cell phones frequently and don't consider the potential health effects. "I'm willing to talk on the phone," said Amy O'Shea, a D.C. resident. "I don't think it's going to hurt me. It's not like I sleep with it."

But new research is serving as a wake-up call. The Environmental Working Group is warning that using a cell phone for 10 years or more significantly increases a person's risk for certain types of brain cancer.

"The studies are showing 50 [to] 90 percent increased risk for those rare tumors," said Jane Houlihan of the Environmental Working Group.

The study shows children are especially vulnerable, as their thinner skulls provide less protection and they absorb twice the radiation as adults.

"Oh that's horrible," said Jeran Gimigliano, a D.C. resident. "That means they absorb everything."

The Food and Drug Administration has found no link between cell phones and cancer but increasing concern sparked a hearing on Capitol Hill. Of particular interest is whether or not hands-free devices provide any protection from radiation.

Experts say the best ways to reduce exposure to radiation from cell phones are to limit cell phone use, text or use speakerphone instead if possible, and stay off the phone when there's a weak signal.

"What we need to know is we can reduce the risk, there are safer solutions, we need to act soon, now," said Kerry Crofton, founder of Radiation Rescue.

The Senate committee also heard from international researchers from nations that have enacted stricter standards -- standards they say should be adopted by the United States.

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