Samsung GALAXY S3 Owner's Manual page 48

Headsets can substantially reduce exposure because
the phone is held away from the head in the user's
hand or in approved body-worn accessories. Cell
phones marketed in the U.S. are required to meet
RF exposure compliance requirements when used
against the head and against the body.
Because there are no known risks from exposure to
RF emissions from cell phones, there is no reason to
believe that hands-free kits reduce risks. Hands-free
kits can be used for convenience and comfort. They
are also required by law in many states if you want
to use your phone while driving.
Cell Phone Accessories that Claim to
Shield the Head from RF Radiation
Because there are no known risks from exposure to
RF emissions from cell phones, there is no reason
to believe that accessories which claim to shield
the head from those emissions reduce risks. Some
products that claim to shield the user from RF
absorption use special phone cases, while others
involve nothing more than a metallic accessory
attached to the phone.
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