Nokia Lumia 920 Manual page 60

requirements regardless of whether they are used against
the head or against the body. Either configuration should
result in compliance with the safety limit.
Do wireless phone accessories that claim to shield the
head from RF radiation work?
Since there are no known risks from exposure to RF
emissions from wireless phones, there is no reason to
believe that accessories that 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. Studies have shown that
these products generally do not work as advertised.
Unlike "hand-free" kits, these so-called "shields" may
interfere with proper operation of the phone. The phone
may be forced to boost its power to compensate, leading
to an increase in RF absorption. In February 2002, the
Federal trade Commission (FTC) charged two companies
that sold devices that claimed to protect wireless phone
users from radiation with making false and
unsubstantiated claims. According to FTC, these
defendants lacked a reasonable basis to substantiate
their claim.
How does the FCC Audit Cell Phone RF?
After FCC grants permission for a particular cellular
telephone to be marketed, FCC will occasionally conduct
"post-grant" testing to determine whether production
versions of the phone are being produced to conform with
FCC regulatory requirements. The manufacturer of a cell
phone that does not meet FCC's regulatory requirements
may be required to remove the cell phone from use and
to refund the purchase price or provide a replacement
phone, and may be subject to civil or criminal penalties. In
addition, if the cell phone presents a risk of injury to the
user, FDA may also take regulatory action. The most
important post-grant test, from a consumer's
perspective, is testing of the RF emissions of the phone.
FCC measures the Specific Absorption Rate (SAR) of the
phone, following a very rigorous testing protocol. As is
true for nearly any scientific measurement, there is a
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