<P> According to the FTC , there is no scientific proof that so - called shields significantly reduce exposure from electromagnetic emissions . Products that block only the earpiece -- or another small portion of the phone -- are totally ineffective because the entire phone emits electromagnetic waves . Such shields `` may interfere with the phone 's signal , cause it to draw even more power to communicate with the base station , and possibly emit more radiation . '' The FTC has enforced false advertising claims against companies that sell such products . </P>
<P> According to the FTC , there is no scientific proof that so - called shields significantly reduce exposure from electromagnetic emissions . Products that block only the earpiece -- or another small portion of the phone -- are totally ineffective because the entire phone emits electromagnetic waves . Such shields `` may interfere with the phone 's signal , cause it to draw even more power to communicate with the base station , and possibly emit more radiation . '' The FTC has enforced false advertising claims against companies that sell such products . </P>
where does radiation come from in a cell phone
where does radiation come from in a cell phone
the entire phone
the entire phone