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In temperature extremes outside the operating limits 
of your phone.
Walking or driving very slowly may also substantially 
reduce GPS performance.
Even where location information can be calculated in 
such situations, 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 center instructs you.
Even where adequate signals from multiple satellites 
are available, your GPS feature will only provide an 
approximate location, 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 Performance” 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 navigation. 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 signals from adequate 
numbers of satellites.
On emergency calls, your phone uses assistance 
information from the phone network to improve the 
speed and accuracy of your phone’s location 
calculation. If such assistance information becomes 
unavailable, it may reduce the speed and accuracy of 
the location calculation.
The satellites used by the GPS feature of your phone 
are controlled by the U.S. government and are subject 
to changes implemented in accordance with the 
Department of Defense GPS user policy and the 
Federal Radionavigation Plan. These changes may 
affect the performance of the GPS feature of your 
phone.
Making an Emergency Call
Dial 911 and press O 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 911 call, the GPS 
feature of your phone begins to seek information to