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SAFETY
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.
11. What about wireless phone interference with medical equipment?
Radiofrequency energy (RF) from wireless phones can interact with some
electronic devices. For this reason, FDA helped develop a detailed test method to
measure electromagnetic interference (EMI) of implanted cardiac pacemakers and
defibrillators from wireless telephones. This test method is now part of a standard
sponsored by the Association for the Advancement of Medical instrumentation
(AAMI). The final draft, a joint effort by FDA, medical device manufacturers,
and many other groups, was completed in late 2000. This standard will allow
manufacturers to ensure that cardiac pacemakers and defibrillators are safe from
wireless phone EMI.
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FDA has tested hearing aids for interference from handheld wireless phones and
helped develop a voluntary standard sponsored by the Institute of Electrical and
Electronic Engineers (IEEE). This standard specifies test methods and performance
requirements for hearing aids and wireless phones so that no interference occurs
when a person uses a "compatible" phone and a "compatible" hearing aid at the
same time. This standard was approved by the IEEE in 2000.
FDA continues to monitor the use of wireless phones for possible interactions with
other medical devices. Should harmful interference be found to occur, FDA will
conduct testing to assess the interference and work to resolve the problem.
Updated July 29, 2003
For more information, please visit the FDA website at http://www.fda.gov/
cellphones.
EMERGENCY CALLS
Never rely solely upon your wireless phone for essential communications (e.g.,
medical emergencies), if it can be avoided, since a wireless phone requires a
complex combination of radio signals, relay stations and landline networks for
its operation. Consequently, emergency calls may not always be possible under
all conditions on all wireless phone systems. Your wireless phone, however, may
SAFETY
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