+
Geofencing - they know where you are.
+
+
+
+
Government, Internet Service Providers (ISPs), Cellular
+ network providers can all find out where you are with the help of
+ your device emitting and receiving radio waves. These entities use various methods to track you
+ down at any given time. This is called Geofencing.
+
+
+
+
+
Tower Triangulation
+
+
+
This is where multiple cellular towers are used to geometrically locate devices connecting or
+ pinging them by measuring the strength of the connection from each tower.
+
+
more towers present around you = more accurate location
+
+
Towers even at a distance of 5 miles from you can be used to triangulate your
+ location precisely.
+
+
+
+
Wifi Triangulation
+
+
+
+
+
Wifi routers often interact together especially when they're from the same ISP. When your
+ device recognizes a wifi network nearby (as seen in the wifi details option of your phone)
+ which also allows them to determine the signal strength of each router.
+
+
This can be used to geometrically determine your device's location based on how strong the
+ nearby signals are, even when you're not connected to it.
+
+
Two routers are enough to track you precisely upto a 6 feet error. You're surrounded
+ by tens of them.
+
+
On Android and Apple devices, wifi can also be used to geofence you with GPS through Google
+ or Apple Network Location Provider (NLP) service. Making it even easier to geo-locate your
+ device.
+
+
+
+
GPS/A-GPS
+
Your phone constantly searches for satellites to connect to Global Positioning System (GPS)
+ signals.
+
+
Both Android and Google devices use Google-SUPL service for gps queries -
+ [supl.google.com:7275]. This happens even if you do not connect your phone to a WiFi or
+ Cellular data.
+
+
Blocking this service greatly impacts cellular data connectivity and disables location
+ services on your device.
+
+
(A-GPS stands for 'Assisted GPS'. It is when the SUPL GPS service works with the on-device
+ GPS module to be even efficient in location tracking.)
+
+
+
+ 
+
+