Microsoft Lumia 640 - Positioning methods

Positioning methods

Your phone shows your location on the map using GPS, GLONASS, A-GPS, Wi-Fi, or network

(Cell ID) based positioning.
The availability, accuracy and completeness of the location information depend on, for

example, your location, surroundings, and third party sources, and may be limited. Location

information may not be available, for example, inside buildings or underground. For privacy

information related to positioning methods, see the Microsoft Mobile Privacy Policy.
The Assisted GPS (A-GPS) network service and other similar enhancements to GPS and

GLONASS retrieve location information using the cellular network, and assists in calculating

your current location.
A-GPS and other enhancements to GPS and GLONASS may require transferring small amounts

of data over the mobile network. If you want to avoid data costs, for example when traveling,

you can switch the mobile data connection off in your phone settings.
Wi-Fi positioning improves positioning accuracy when satellite signals are not available,

especially when you are indoors or between tall buildings. If you're in a place where the use

of Wi-Fi is restricted, you can switch Wi-Fi off in your phone settings.

Note: Using Wi-Fi may be restricted in some countries. For example, in the EU, you are

only allowed to use 5150–5350 MHz Wi-Fi indoors, and in the USA and Canada, you are

only allowed to use 5.15–5.25 GHz Wi-Fi indoors. For more information, contact your

local authorities.

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