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AGPS limitations & tips

Your phone uses Assisted Global Positioning 
System (AGPS) satellite signals to estimate 
your location. If your phone cannot find strong 
satellite signals, your AGPS might be slower, 
less accurate, or it might not work at all. AGPS 
provides only an approximate location, often 
within 150 feet (45 meters) but sometimes 
much farther from your actual location. 

To improve AGPS accuracy:

• Go outside and away from 

underground locations, covered 
vehicles, structures with metal or 
concrete roofs, tall buildings, and 
foliage. Indoor performance might 
improve if you move closer to window, 
but some window sun-shielding films 
can block satellite signals.

• Move away from radios, entertainment 

equipment, and other electronic 
devices that might interfere with or 
block AGPS satellite signals.

• Extend your phone antenna. 

• Hold your phone away from your body, 

and point the phone antenna toward 
the sky. Do not cover the antenna area 
with your fingers.

AGPS uses satellites controlled by the U.S. 
government and subject to changes 
implemented in accordance with the 
Department of Defense AGPS user policy and 
the Federal Radio Navigation Plan. These 
changes might affect AGPS performance.