To view or change the location transmission status of your phone during a call, press s> Option > AGPS Service
> Choose On or Off.
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 windows, 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.
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.