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Making an Emergency Call
• When your GPS antenna is covered (for
example, by your hand or other object) or
facing the ground
• In temperature extremes outside the
operating limits of your phone
Walking or driving very slowly m ay also
substantially reduce GPS performa nce.
Even where location inform ation can be
calculated in such situ ations, it may take much
longer to do so, and your location estimate may
not be as accurate. Therefore, in any 911 call,
always report the location to the emergency
response center if you can and if you cannot,
remain on your phone for as long as the
emergency response ce nter instructs you.
Even where adequate signal s from multiple
satellites are available , your GPS feature will
only provide an approximate loca tion, often
within 150 feet (45 meters) but sometimes
much further from your actual location. Advice
on how to improve GPS performance is
provided in “Enhancing GPS Perfor mance” on
page 125.
While the GPS feature of your phone can be a
valuable navigational aid, it does not replace the
need for careful navigating and good judgment.
Never rely solely on one device for naviga tion.
Remember that the accuracy of the location
information and the time needed to obtain it will
vary depending on circumstances, particularly the
ability to receive signal s f rom ad eq ua te nu mb ers o f
satellites.
On emergency calls, your phone us es assistance
information from the ph one network to improve the
speed and accuracy of your phone’s locati on
calculation: if such assistance information
becomes unavailable, it m ay red uce the sp ee d and
accuracy of the location calc ulation.
The satellites used by the GPS feature of your
phone are controlled by the U .S. government and
are subject to changes imp le me nted i n acc ord an ce
with the Department of Defense GPS us er po li cy
and the Federal Radionavigation Plan. These
changes may affect the performance of the GPS
feature of your phone.
Making an Emergency Call
Dial 911 to be connected to an emergency
response center. If you are on an active call, you
must end it before calling 911.
When you make an emergency 91 1 ca ll, the GPS
feature of your phone begi ns to se ek i nf or mat i on to
calculate your approximate location. It will take
the GPS feature of your phone some time to
determine your approximate locati on. Even
where your phone has good access to sufficient